SJ 20645-1997 Microwave circuit amplifier test method

This standard applies to the electrical parameter test of low noise amplifiers, power amplifiers, limiting amplifiers, controllable gain amplifiers and pulse amplifiers. SJ 20645-1997 Microwave Circuit Amplifier Test Method SJ20645-1997 Standard Download Decompression Password: www.bzxz.net

Military Standard of the Electronic Industry of the People's Republic of China FL5962
SJ 20645-97
Microwave circuits
Measuring methods for amplifiers1997-06-17Published
1997-10-01Implementation
Approved by the Ministry of Electronics Industry of the People's Republic of China1 Scope
1.1 Subject content
1.2 Scope of application
2 Reference documents
3 Definitions
3.1 Symbols
4 General requirements
5 Detailed requirements
5.1 Power gain Gr
|5.2 Power gain flatness AGp
5.3 Linear power gain Guin
5.4 Linear power gain flatness AGm
5.5 Gain slope K
5.6 Out-of-band gain suppression
5.7 Reverse isolation ISO
5.8 Gain control range AGre
5.9 Output power limit Partra) and amplitude limit APrltd)5.10 Output power P.
5.111 dB compressed output power PadB)
5.12 Noise figure NF
S.13 Voltage standing wave ratio VSWR
Harmonic suppression and clutter suppression
5.15 Parasitic modulation suppression
5.16 Output noise power spectrum density
5.17 Third-order intermodulation distortion IM
Third-order intermodulation intercept point power P3(Ir))
5.19 Phase shift
5.20 AM/PM conversion coefficient α(AM-PM)
5.21 Group delay td(gp)
Pulse response time
Additional single sideband phase sound
.. (1)
TYKAONKACa-
People's Republic of China Electronic Industry Military Standard Microwave Circuit Amplifier Test Methods
Microwaveircuits
Measuring methods for amplifiers1 Scope
1.1 Subject content
This standard specifies the basic principles of the test methods for the electrical parameters of microwave amplifiers. 1.2 Applicable scope
SJ 20645-97
This standard applies to the electrical parameter testing of low noise amplifiers, power amplifiers, limiting amplifiers, controllable gain amplifiers and pulse amplifiers.
2 Referenced documents
SJ20612-96 Microwave circuit parameter text symbols 3 Definitions
3.1 Symbols
The parameter symbols used in this standard comply with the provisions of SJ20612-96. 4 General requirements
4.1 Test conditions and environmental requirements shall comply with the provisions of the product detailed specifications. 4.2 The test instruments shall have the specified accuracy and pass the metrological inspection. 4.3 The power range of the test instruments shall meet the test requirements. 4.4 The range of the power meter shall meet the test requirements. 4.5 The attenuation of the attenuator shall meet the test requirements. 4.6 If the signal comes from an attenuator and meets the requirements, the variable attenuator in the test block diagram can be omitted. 4.7 During the test, connect the test instruments according to the test block diagram and preheat them according to the operating requirements. 4.8 During the test, the environmental conditions should be free of mechanical vibration and electromagnetic interference that may affect the accuracy of the test results. 5 Detailed requirements
5.1 Power gain Gr
5. 1. 1 Method 1
The Ministry of Electronics Industry of the People's Republic of China Issued on June 17, 1997 Implemented on October 1, 1997
5.1.1.1 SJ 20645-97
Under specified conditions, the ratio of the input power to the input power of the microwave amplifier is measured. 5.1.1.2 Test diagram
The test block diagram is shown in Figure 1.
Isolator
Signal source
5.1.1.3 Test principle
Variable attenuator
Directional coupler 1
Power discussion!
Power juice 2
Figure 1 Power gain test diagram
Tested amplifier
Bias power supply
Directional coupler 2
Prespector
In Figure 1, the input power P1 (dB.) and output power P2 (dB,) of the amplifier are calculated by the following formula: P1 =P1 +C-LI
P= Pa t L2
Where: P——Power measured by power meter 1, dB.; P
Power measured by power meter 2, dB
L Main path insertion loss of directional coupler 1, dB: C—Coefficient of directional coupler 1, dB;
L.2——Main path insertion loss of directional coupler 2, dB. The power gain Gp (dB) is calculated by the following formula:
Gr= P.-P:
5.1.1.4Test equipment requirements
a: The isolation of the isolator should not be less than 20dB:b, The main path insertion loss and coupling degree of the directional coupler should be determined in advance, and the directivity should be high enough:c, The spectrum analyzer is used to observe the spectral purity and self-excitation of the amplifier under test. ·(1)
d, If the amplifier under test is a pulse power amplifier, the signal source in the block diagram should be replaced with a pulse modulated signal source, the power meter should be replaced with a pulse power meter, and a detector and an oscilloscope should be connected to monitor the envelope waveform. 5.1.1.5Precautions
When the spectrum purity is detected by the spectrum analyzer and affects the test accuracy, the test results should be corrected. 5.1.1.6 Test steps
a. Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency; for pulse power amplifiers, adjust the output pulse width and duty cycle of the signal source to the specified values;
c. Apply the specified bias to the amplifier under test; 2
ITKAONKAca-
SJ 20645-97
Read P1 with power meter 1, calculate P by formula (1), so that the input power P applied to the amplifier under test is the specified value; Read P2 with power meter 2, calculate Pe by formula (2); Calculate the power gain by formula (3), and monitor the output spectrum of the amplifier with a spectrum analyzer during the test. Specified conditions
Ambient temperature or reference point temperature;
Bias rate;
Test frequency;
Input power;
Pulse width and duty cycle of input signal (applicable only to pulse power amplifiers). 5.1.2 Method 2
5.1.2.1 Purpose
Measure the ratio of output power to input power of a microwave amplifier under specified conditions. 5.1.2.2 Test block diagram
The test block diagram is shown in Figure 2.
Scalar network analyzer
Power divider
5.1.2.3 Retro-test principle
Amplifier under test
Bias power supply
Detector 2
Detector 1
Figure 2 Power gain test block diagram
In Figure 2, the input power P (dB.) and output power P (dBm) of the amplifier under test are calculated by the following formula: P, = Pi * L
Formula: P, - the value measured by detector 1, dBm; P2 - the value measured by detector 2, dBm; L - the tracking error value of the power divider, dB, and the power gain G (dB) is calculated by formula (3). 5.1.2.4 Test equipment requirements
a. The tracking error of the power divider should be measured in advance; b. The harmonic and shelf wave components of the signal source should be small enough to avoid affecting the test accuracy. 5.1.2.5 Notes
The attenuator should be connected to the circuit as needed to prevent the output power of the amplifier under test from being too large and burning the detector, and the II itself should also be able to withstand this power.
5.1.2.6 Test steps
Adjust the mixing degree to the specified value;
SI20645-97
b. Adjust the output frequency of the swept frequency signal source of the scalar network analyzer to the center frequency point of the test frequency range: add the specified bias to the amplifier under test; c.
Use the pick-up to read P1 and calculate P by formula (4) so ​​that the input power P applied to the amplifier under test is the specified d.
Set the output frequency range of the swept frequency signal source of the scalar network analyzer to the specified test frequency range; e
f. On the scalar network analyzer,Select "A/B\ working mode; g: directly read the power gain Gp of the corresponding test frequency on the scalar network analyzer. 5.1.2.7 Specified conditions
a, ambient temperature or reference point temperature;
b, programming hardware;
c, test frequency range:
d, wheel power.
5.2 Power gain flatness △Gr
5.2.1 Method 1
5.2.1. 1 Under the specified conditions, measure the difference between the maximum and minimum power gain of the micro-wave amplifier. 5.2.1.2 Test data
The test block diagram is shown in Figure 1.
5.2.1.3 Test principle
The test principle is the same as 5.1, 1.3.
The power gain flatness 4G(clB) is calculated by the formula: AGp - (μuax - Gponin
Where: Gpmax—the maximum power gain measured within the specified frequency range and the specified input power conditions, lB; Gmin—the minimum power gain measured within the specified frequency range and the specified input power conditions, dB. 5.2.1.4 Test equipment requirements
The test equipment requirements are the same as 5.1.1.4
5.2.1.5 Precautions
Precautions are the same as those in 5.1.1.5.
5.2.1.6 Test steps
Adjust the temperature to the specified value;
b, adjust the output frequency of the signal source to the center frequency point of the test frequency range; c.
Add the specified bias to the amplifier under test; read P with power meter 1, calculate P by formula (1), so that the input power P applied to the amplifier under test is the specified value; d.
Read P2 with power meter 2, calculate P by formula (2); e.
r. Calculate the power gain by formula (3):
g: Within the specified frequency range, continuously change the signal source frequency, and measure the maximum power gain (mx) and the minimum power gain (G). pmin, mountain formula (6) to calculate the power gain flatness 4Gpe5.2.1.7 Specified conditions
a, ambient temperature or reference point temperature;
b, bias conditions:
c. Test frequency range;
d. Test power.
5.2.2 Method 2
5.2.2.1 Purpose
Under specified conditions, measure the difference between the maximum and minimum power gain of the microwave amplifier. 5.2.2.2 Test block diagram
The test diagram is shown in Figure 2.
5.2.2.3 Test principle
The test principle is the same as 5.1.2.3.
The power gain flatness AGp (dB) is calculated by formula (6). 5.2.2.4 Test equipment requirements
The test equipment requirements are the same as 5.1.2.4.
5.2.2.5 Precautions
Precautions are the same as those in 5.1.2.5.
5.2.2.6 Test steps
a. Adjust the temperature to the specified value;
Adjust the output frequency of the sweep signal source of the scalar network analyzer to the central frequency point of the test frequency range: h.
c. Add a specified bias to the amplifier under test; read P with detector 1, and calculate Wei by formula (4) so ​​that the input power P applied to the amplifier under test is specified. d.
Set the output frequency range of the sweep signal of the scalar network analyzer to the specified filter test frequency range; e.
fOn the scalar network analyzer, select the working formula of \A/B\: On the scalar network analyzer, measure the maximum power gain G and the minimum power gain Grmin within the specified frequency range, and directly read the power gain flatness 4Gpo5.2.2.7 Specified conditions
Ambient temperature or reference point temperature:
b, bias conditions;
c. Test frequency range;
Input power.
5.3 Linear power gain Gm
5.3.1 Method 1
Under the specified conditions, measure the power gain of the microwave amplifier in the linear working area. 5.3.1.2 Test block diagram
The test block diagram is shown in Figure 1.
5.3.1.3 Test principle
The test principle is the same as 5.1.1.3.
SJ20645-97
Linear working area: It is the area where the output power change (in B) is the same as the input power change (in cIB).
The linear power gain is the power gain in this area. 5.3.1.4 Test equipment requirements
The test equipment requirements are the same as 5.1.1.4.
5.3.1.5 Precautions
Precautions are the same as those in 5.1.1.5.
5.3.1.6 Test steps
a. Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency;c. Apply the specified bias conditions to the amplifier under test;d. Apply appropriate input power to the amplifier under test;e. Adjust the output of the signal source to change the input power of the amplifier under test and determine the linear region of the amplifier's power gain: If there are no other provisions, the nominal 1 dB gain compression point output power Pa1ar of the amplifier under test; the corresponding input power back-off 15=3dB area is regarded as the linear working area of ​​the amplifier;F. Select any input power in the linear region, read P and P respectively by power meter 1 and power meter 2, and calculate the linear power gain Glin by formula (1) to (3).
5.3.1.7 Specified conditions
a. Ambient temperature or reference point temperature;
b. Bias conditions;
c. Test frequency.
5.3.2 Method 2
5.3.2. 1 Purpose
Under specified conditions, measure the power gain of the microwave amplifier in the linear working region. 5.3.2.2 Test block diagram
The test block diagram is shown in Figure 2.
5.3.2.3 Test principle
The test principle is the same as 5.1.2.3
Linear working region: It is the region where the output power change (in B units) is the same as the input power change (in d3 units).
Linear power gain is the power gain in this area. 5.3.2.4 Test equipment requirements
Test equipment requirements are the same as 5.2.1.4.
5.3.2.5 Precautions
Precautions are the same as 5.1.2.5.
5.3.2.6 Test steps
a: Adjust the temperature to the specified value:
. Adjust the input frequency of the swept frequency signal source of the scalar network analysis to the center frequency point of the test frequency range; c. Apply the specified bias conditions to the amplifier under test;—6
HTTKAONTKAca-
SJ20645-97
d. Apply appropriate input power to the amplifier under test; adjust the output of the swept frequency signal source to change the input power of the amplifier under test, and determine the linear region of the amplifier's power gain; if there are no other regulations, the nominal 1% of the amplifier under test is the gain compression point output power P. 1aa) The input power interval corresponding to 15±3dB is regarded as the linear working area of ​​the amplifier; ". Select any input power in the linear area; g. Set the output frequency range of the sweep signal source of the scalar network analyzer to the specified test frequency range; on the scalar network analyzer, select the \A/B\ working mode: h.
i. On the scalar network analyzer, directly read the linear power gain Gin at each frequency point. 5.3.2.7 Specified conditions
a. Ambient temperature or reference point temperature:
b. Setting conditions;
Test frequency range.
5.4 Linear power gain flatness AGil
5.4.1 Method [
5.4.1.1 Purpose
Measure the difference between the maximum and minimum values ​​of the linear power gain of the microwave amplifier under specified conditions. 5.4. 1.2 Test diagram
The test diagram is shown in Figure 1.
5.4.1.3 Test principle
The test principle is the same as 5.3.1.3.
Calculate the linear power gain flatness △Gn (dB) by the following formula: AGlin = Gliamax-Glnnin
Where: Glnma—the maximum linear power gain measured within the specified frequency range, dB; Glinmin———the minimum linear power gain measured within the specified frequency range, dB. 5.4.1.4 Test equipment requirements
The test equipment requirements are the same as 5.1.1.4.
5.4.1.5 Precautions
Precautions are the same as those in 5.1.1.5.
5.4.1.6 Test steps
Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the center frequency point of the test frequency range; t. Add the specified settings to the amplifier under test; apply appropriate input power to the amplifier under test; e. Read P1 and P2 with power meter 1 and power meter 2 respectively, and calculate the power gain using formulas (1) to (3); +++(7
f. Adjust the output of the signal source to change the input power of the amplifier under test and determine the linear region of the amplifier's power gain; if there are no other provisions, the input power back-off 15-3113 area corresponding to the nominal 1 dB gain compression point output power Pu1 of the amplifier under test is regarded as the linear operating region of the amplifier; g: select any input power in the linear region; h. Continuously change the signal source frequency within the specified frequency range and measure the amplifier under test 1. Calculate the linear power gain flatness △Gin by formula (7) 5.4.1.7 Specified conditions a. Ambient temperature or reference point temperature b. Bias conditions c. Test frequency range 5.4.2 Method 2 5.4.2.1 Purpose To measure the difference between the maximum and minimum values ​​of the linear power gain of the microwave amplifier under specified conditions. 5.4.2.2 Test block diagram The test block diagram is shown in Figure 2 As shown.
5.4.2.3 Test principle
Test principle is the same as 5.3.2.3.
Calculate the linear power gain flatness A (cB) by formula (7). 5.4.2.4 Test equipment requirements
Test equipment requirements are the same as 5.1.2.4
5.4.2.5 Precautions
Precautions are the same as 5.1.2.5.
5.4.2.6 Test steps
a. Adjust the temperature to the specified value;
b. Adjust the output frequency of the swept frequency signal source of the scalar network analyzer to the center frequency point of the test frequency range; c. Add the specified bias to the amplifier under test; d. Apply appropriate input power to the amplifier under test; adjust the output of the signal source to change the input power of the amplifier under test and determine the linear region of the amplifier's power gain; e.
or unless otherwise specified, the nominal 1% of the amplifier under test and its gain compression point output power P. ld) corresponding to the input power back-off 15±3dB region is considered the amplifier's linear working region; f. Optional input power in the linear region:
Adjust the output frequency range of the scalar network analyzer's sweep signal source to the specified test frequency range: g
h, on the scalar network analyzer, select the \A/B\ working mode:], on the scalar network analyzer, within the specified frequency range, measure the maximum linear power gain Grinmnxt: minimum linear power gain Glimin: and directly read the linear power gain flatness AGming5.4.2.7 Specified conditions
a: environmental hysteresis or reference point temperature;
h. Bias operation:
. Test frequency range.
5.5 Increase slope K
Under the specified conditions, measure the ratio of the change in the microwave amplifier power gain to the change in frequency. 5.5.2 Test block diagram
The test block diagram is shown in Figure 1.
5.5.3 Test principle
TTKAONKAa-
The test principle is the same as 5.1, 1.3.
SJ20645-97
At the specified frequency f1 and f2 +4f and f2 -4f, respectively measure the power gain of the microwave amplifier, and calculate the gain slope K (dB/MHz) by the following formula:
K = (G.-G.)/(f-fo)
Where: f1 — specified test frequency point, MHz; f1 + AF or f2 -Af, MHz;
4f — frequency increment, MHz;
G,- — power gain corresponding to f1, dB;
G and f2 corresponding to f1, dB.
5.5.4 Test equipment requirements
Test equipment requirements are the same as 5.1.1., 4.
5.5.5 Precautions
a, Precautions are the same as 5.1.1.5;
h. The frequency increment 4f should be small enough.
5.5.6 Test steps
a~e Questions Test steps 5.1.1.6 a~e: f. Corresponding to the specified test frequency f. and f, the corresponding power gains G and GG are measured, which are two values); g, calculated by formula (8), the larger of the two values ​​is recorded as f. The gain slope K at f. 5.5.7 Specified conditions
&. Ambient mirror temperature or reference point temperature;
h, Setting conditions:
c. Input power;
d. Test frequency.
5.6 Out-of-band gain suppression
5.6.1 Under specified conditions, measure the difference between the gain of the microwave amplifier in the specified frequency band outside the operating frequency range and the gain in the band.
5.6.2 Test diagram
The test block diagram is shown in Figure 3.
Isolator
Signal source
5.6.3 Test principle
Variable attenuator
Directional coupler
Figure 3 Out-of-band gain suppression test diagram
Amplifier under test
Power supply
Power attenuator
Under specified input power conditions, the spectrum analyzer directly reads the specified frequency signal output amplitude P (dBm) of the amplifier's operating frequency range and the maximum signal amplitude P (dB) on the specified out-of-band frequency band. 9
SJ 20645-97
The difference between P. and P. is the out-of-band gain suppression of the amplifier, in dR. 5.6.4 Test equipment requirements
a. The dynamic range of the spectrum analyzer meets the test requirements; b. The isolation of the isolator is not less than 20dB. The main path insertion loss and coupling of the directional combiner should be determined in advance. 5.6.5 Notes
When the output power of the amplifier is large, the attenuation of the power attenuator should be increased to prevent damage to the spectrum analyzer. 5.6.6 Test steps
Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency within the band; c. Add the specified bias to the amplifier under test; d. Use the power meter reading limit P to calculate P from formula (1) so that the input power P, applied to the amplifier under test, is the specified value: 6. Continuously change the frequency of the signal source, and read the difference between the maximum signal amplitude within the specified frequency band outside the band and the signal amplitude of the specified frequency within the band on the spectrum analyzer, which is the out-of-band suppression of the amplifier. 5.6.7 Specified conditions
a. Ambient temperature or base point temperature;
b. Bias conditions;
. Specified frequency within the operating frequency range: 5. Input power;
c. Out-of-band frequency band.
5.7 Reverse isolation IS)
Measure the reverse isolation of the microwave amplifier under the specified conditions. 5.7.2 Test diagram
The test block diagram is shown in Figure 1, but the amplifier output end should be connected to directional coupler 1 and the input end should be connected to directional coupler 2.
5.7.3 Test principle
The test principle is the same as 5.1.1.3.
Calculate the reverse isolation ISO (dB) by the following formula: ISO = P: - P.
Where: P. Input power, dB:
P. - output power, dB.
5.7.4 Test equipment requirements
Test equipment requirements are the same as 5.1.1.4.
5.7.5 Precautions
Precautions are the same as 5.1.1.5.
5.7.6 Test steps
a. Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency:: Add the specified bias to the amplifier under test; (9)
TTTKAONKAca-Calculate the power gain using formulas (1) to (3); +++(7
f. Adjust the output of the signal source to change the input power of the amplifier under test and determine the linear region of the amplifier's power gain; if there are no other provisions, the area where the input power back-off 15-3113 corresponding to the nominal 1 dB gain compression point output power Pu1 of the amplifier under test is considered the linear operating region of the amplifier; g: select any input power in the linear region; h. Within the specified frequency range, continuously change the signal source frequency and measure the maximum linear power gain Glrunx and the minimum linear power gain Gin of the amplifier under test. nin; II 7
S.I2064597
1. Calculate the linear power gain flatness △Gin by formula (7) 5.4.1.7 Specified conditions
a. Ambient temperature or reference point temperature;
b. Bias conditions:
c. Test frequency range.
5.4.2 Method 2
5.4.2.1 Purpose
Measure the difference between the maximum and minimum values ​​of the linear power gain of the microwave amplifier under specified conditions. 5.4.2.2 Test block diagram
The test block diagram is shown in Figure 2 As shown.
5.4.2.3 Test principle
Test principle is the same as 5.3.2.3.
Calculate the linear power gain flatness A (cB) by formula (7). 5.4.2.4 Test equipment requirements
Test equipment requirements are the same as 5.1.2.4
5.4.2.5 Precautions
Precautions are the same as 5.1.2.5.
5.4.2.6 Test steps
a. Adjust the temperature to the specified value;
b. Adjust the output frequency of the swept frequency signal source of the scalar network analyzer to the center frequency point of the test frequency range; c. Add the specified bias to the amplifier under test; d. Apply appropriate input power to the amplifier under test; adjust the output of the signal source to change the input power of the amplifier under test and determine the linear region of the amplifier's power gain; e.
or unless otherwise specified, the nominal 1% of the amplifier under test and its gain compression point output power P. ld) corresponding to the input power back-off 15±3dB region is considered the amplifier's linear working region; f. Optional input power in the linear region:
Adjust the output frequency range of the scalar network analyzer's sweep signal source to the specified test frequency range: g
h, on the scalar network analyzer, select the \A/B\ working mode:], on the scalar network analyzer, within the specified frequency range, measure the maximum linear power gain Grinmnxt: minimum linear power gain Glimin: and directly read the linear power gain flatness AGming5.4.2.7 Specified conditions
a: environmental hysteresis or reference point temperature;
h. Bias operation:
. Test frequency range.
5.5 Increase slope K
Under the specified conditions, measure the ratio of the change in the microwave amplifier power gain to the change in frequency. 5.5.2 Test block diagram
The test block diagram is shown in Figure 1.
5.5.3 Test principle
TTKAONKAa-
The test principle is the same as 5.1, 1.3.
SJ20645-97
At the specified frequency f1 and f2 +4f and f2 -4f, respectively measure the power gain of the microwave amplifier, and calculate the gain slope K (dB/MHz) by the following formula:
K = (G.-G.)/(f-fo)
Where: f1 — specified test frequency point, MHz; f1 + AF or f2 -Af, MHz;
4f — frequency increment, MHz;
G,- — power gain corresponding to f1, dB;
G and f2 corresponding to f1, dB.
5.5.4 Test equipment requirements
Test equipment requirements are the same as 5.1.1., 4.
5.5.5 Precautions
a, Precautions are the same as 5.1.1.5;
h. The frequency increment 4f should be small enough.
5.5.6 Test steps
a~e Questions Test steps 5.1.1.6 a~e: f. Corresponding to the specified test frequency f. and f, the corresponding power gains G and GG are measured, which are two values); g, calculated by formula (8), the larger of the two values ​​is recorded as f. The gain slope K at f. 5.5.7 Specified conditions
&. Ambient mirror temperature or reference point temperature;
h, Setting conditions:
c. Input power;
d. Test frequency.
5.6 Out-of-band gain suppression
5.6.1 Under specified conditions, measure the difference between the gain of the microwave amplifier in the specified frequency band outside the operating frequency range and the gain in the band.
5.6.2 Test diagram
The test block diagram is shown in Figure 3.
Isolator
Signal source
5.6.3 Test principle
Variable attenuator
Directional coupler
Figure 3 Out-of-band gain suppression test diagram
Amplifier under test
Power supply
Power attenuator
Under specified input power conditions, the spectrum analyzer directly reads the specified frequency signal output amplitude P (dBm) of the amplifier's operating frequency range and the maximum signal amplitude P (dB) on the specified out-of-band frequency band. 9
SJ 20645-97
The difference between P. and P. is the out-of-band gain suppression of the amplifier, in dR. 5.6.4 Test equipment requirements
a. The dynamic range of the spectrum analyzer meets the test requirements; b. The isolation of the isolator is not less than 20dB. The main path insertion loss and coupling of the directional combiner should be determined in advance. 5.6.5 Notes
When the output power of the amplifier is large, the attenuation of the power attenuator should be increased to prevent damage to the spectrum analyzer. 5.6.6 Test steps
Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency within the band; c. Add the specified bias to the amplifier under test; d. Use the power meter reading limit P to calculate P from formula (1) so that the input power P, applied to the amplifier under test, is the specified value: 6. Continuously change the frequency of the signal source, and read the difference between the maximum signal amplitude within the specified frequency band outside the band and the signal amplitude of the specified frequency within the band on the spectrum analyzer, which is the out-of-band suppression of the amplifier. 5.6.7 Specified conditions
a. Ambient temperature or base point temperature;
b. Bias conditions;
. Specified frequency within the operating frequency range: 5. Input power;
c. Out-of-band frequency band.
5.7 Reverse isolation IS)
Measure the reverse isolation of the microwave amplifier under the specified conditions. 5.7.2 Test diagram
The test block diagram is shown in Figure 1, but the amplifier output end should be connected to directional coupler 1 and the input end should be connected to directional coupler 2.
5.7.3 Test principle
The test principle is the same as 5.1.1.3.
Calculate the reverse isolation ISO (dB) by the following formula: ISO = P: - P.
Where: P. Input power, dB:
P. - output power, dB.
5.7.4 Test equipment requirements
Test equipment requirements are the same as 5.1.1.4.
5.7.5 Precautions
Precautions are the same as 5.1.1.5.
5.7.6 Test steps
a. Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency:: Add the specified bias to the amplifier under test; (9)
TTTKAONKAca-Calculate the power gain using formulas (1) to (3); +++(7
f. Adjust the output of the signal source to change the input power of the amplifier under test and determine the linear region of the amplifier's power gain; if there are no other provisions, the area where the input power back-off 15-3113 corresponding to the nominal 1 dB gain compression point output power Pu1 of the amplifier under test is considered the linear operating region of the amplifier; g: select any input power in the linear region; h. Within the specified frequency range, continuously change the signal source frequency and measure the maximum linear power gain Glrunx and the minimum linear power gain Gin of the amplifier under test. nin; II 7
S.I2064597
1. Calculate the linear power gain flatness △Gin by formula (7) 5.4.1.7 Specified conditions
a. Ambient temperature or reference point temperature;
b. Bias conditions:
c. Test frequency range.
5.4.2 Method 2
5.4.2.1 Purpose
Measure the difference between the maximum and minimum values ​​of the linear power gain of the microwave amplifier under specified conditions. 5.4.2.2 Test block diagram
The test block diagram is shown in Figure 2 As shown.
5.4.2.3 Test principle
Test principle is the same as 5.3.2.3.
Calculate the linear power gain flatness A (cB) by formula (7). 5.4.2.4 Test equipment requirements
Test equipment requirements are the same as 5.1.2.4
5.4.2.5 Precautions
Precautions are the same as 5.1.2.5.
5.4.2.6 Test steps
a. Adjust the temperature to the specified value;
b. Adjust the output frequency of the swept frequency signal source of the scalar network analyzer to the center frequency point of the test frequency range; c. Add the specified bias to the amplifier under test; d. Apply appropriate input power to the amplifier under test; adjust the output of the signal source to change the input power of the amplifier under test and determine the linear region of the amplifier's power gain; e.
or unless otherwise specified, the nominal 1% of the amplifier under test and its gain compression point output power P. ld) corresponding to the input power back-off 15±3dB region is considered the amplifier's linear working region; f. Optional input power in the linear region:
Adjust the output frequency range of the scalar network analyzer's sweep signal source to the specified test frequency range: g
h, on the scalar network analyzer, select the \A/B\ working mode:], on the scalar network analyzer, within the specified frequency range, measure the maximum linear power gain Grinmnxt: minimum linear power gain Glimin: and directly read the linear power gain flatness AGming5.4.2.7 Specified conditions
a: environmental hysteresis or reference point temperature;
h. Bias operation:
. Test frequency range.
5.5 Increase slope K
Under the specified conditions, measure the ratio of the change in the microwave amplifier power gain to the change in frequency. 5.5.2 Test block diagram
The test block diagram is shown in Figure 1.
5.5.3 Test principle
TTKAONKAa-
The test principle is the same as 5.1, 1.3.
SJ20645-97
At the specified frequency f1 and f2 +4f and f2 -4f, respectively measure the power gain of the microwave amplifier, and calculate the gain slope K (dB/MHz) by the following formula:
K = (G.-G.)/(f-fo)
Where: f1 — specified test frequency point, MHz; f1 + AF or f2 -Af, MHz;
4f — frequency increment, MHz;
G,- — power gain corresponding to f1, dB;
G and f2 corresponding to f1, dB.
5.5.4 Test equipment requirements
Test equipment requirements are the same as 5.1.1., 4.
5.5.5 Precautions
a, Precautions are the same as 5.1.1.5;
h. The frequency increment 4f should be small enough.
5.5.6 Test steps
a~e Questions Test steps 5.1.1.6 a~e: f. Corresponding to the specified test frequency f. and f, the corresponding power gains G and GG are measured, which are two values); g, calculated by formula (8), the larger of the two values ​​is recorded as f. The gain slope K at f. 5.5.7 Specified conditions
&. Ambient mirror temperature or reference point temperature;
h, Setting conditions:
c. Input power;
d. Test frequency.
5.6 Out-of-band gain suppression
5.6.1 Under specified conditions, measure the difference between the gain of the microwave amplifier in the specified frequency band outside the operating frequency range and the gain in the band.
5.6.2 Test diagram
The test block diagram is shown in Figure 3.
Isolator
Signal source
5.6.3 Test principle
Variable attenuator
Directional coupler
Figure 3 Out-of-band gain suppression test diagram
Amplifier under test
Power supply
Power attenuator
Under specified input power conditions, the spectrum analyzer directly reads the specified frequency signal output amplitude P (dBm) of the amplifier's operating frequency range and the maximum signal amplitude P (dB) on the specified out-of-band frequency band. 9
SJ 20645-97
The difference between P. and P. is the out-of-band gain suppression of the amplifier, in dR. 5.6.4 Test equipment requirements
a. The dynamic range of the spectrum analyzer meets the test requirements; b. The isolation of the isolator is not less than 20dB. The main path insertion loss and coupling of the directional combiner should be determined in advance. 5.6.5 Notes
When the output power of the amplifier is large, the attenuation of the power attenuator should be increased to prevent damage to the spectrum analyzer. 5.6.6 Test steps
Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency within the band; c. Add the specified bias to the amplifier under test; d. Use the power meter reading limit P to calculate P from formula (1) so that the input power P, applied to the amplifier under test, is the specified value: 6. Continuously change the frequency of the signal source, and read the difference between the maximum signal amplitude within the specified frequency band outside the band and the signal amplitude of the specified frequency within the band on the spectrum analyzer, which is the out-of-band suppression of the amplifier. 5.6.7 Specified conditions
a. Ambient temperature or base point temperature;
b. Bias conditions;
. Specified frequency within the operating frequency range: 5. Input power;
c. Out-of-band frequency band.
5.7 Reverse isolation IS)
Measure the reverse isolation of the microwave amplifier under the specified conditions. 5.7.2 Test diagram
The test block diagram is shown in Figure 1, but the amplifier output end should be connected to directional coupler 1 and the input end should be connected to directional coupler 2.
5.7.3 Test principle
The test principle is the same as 5.1.1.3.
Calculate the reverse isolation ISO (dB) by the following formula: ISO = P: - P.
Where: P. Input power, dB:
P. - output power, dB.
5.7.4 Test equipment requirements
Test equipment requirements are the same as 5.1.1.4.
5.7.5 PrecautionsWww.bzxZ.net
Precautions are the same as 5.1.1.5.
5.7.6 Test steps
a. Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency:: Add the specified bias to the amplifier under test; (9)
TTTKAONKAca-4.2 Method 2
5.4.2.1 Purpose
Measure the difference between the maximum and minimum values ​​of the linear power gain of the microwave amplifier under specified conditions. 5.4.2.2 Test block diagram
The test block diagram is shown in Figure 2.
5.4.2.3 Test principle
Test principle is the same as 5.3.2.3.
Calculate the linear power gain flatness A (cB) by formula (7). 5.4.2.4 Test equipment requirements
Test equipment requirements are the same as 5.1.2.4
5.4.2.5 Precautions
Precautions are the same as 5.1.2.5.
5.4.2.6 Test steps
a. Adjust the temperature to the specified value;
b. Adjust the output frequency of the swept frequency signal source of the scalar network analyzer to the center frequency point of the test frequency range; c. Add the specified bias to the amplifier under test; d. Apply appropriate input power to the amplifier under test; adjust the output of the signal source to change the input power of the amplifier under test and determine the linear region of the amplifier's power gain; e.
or unless otherwise specified, the nominal 1% of the amplifier under test and its gain compression point output power P. ld) corresponding to the input power back-off 15±3dB region is considered the amplifier's linear working region; f. Optional input power in the linear region:
Adjust the output frequency range of the scalar network analyzer's sweep signal source to the specified test frequency range: g
h, on the scalar network analyzer, select the \A/B\ working mode:], on the scalar network analyzer, within the specified frequency range, measure the maximum linear power gain Grinmnxt: minimum linear power gain Glimin: and directly read the linear power gain flatness AGming5.4.2.7 Specified conditions
a: environmental hysteresis or reference point temperature;
h. Bias operation:
. Test frequency range.
5.5 Increase slope K
Under the specified conditions, measure the ratio of the change in the microwave amplifier power gain to the change in frequency. 5.5.2 Test block diagram
The test block diagram is shown in Figure 1.
5.5.3 Test principle
TTKAONKAa-
The test principle is the same as 5.1, 1.3.
SJ20645-97
At the specified frequency f1 and f2 +4f and f2 -4f, respectively measure the power gain of the microwave amplifier, and calculate the gain slope K (dB/MHz) by the following formula:
K = (G.-G.)/(f-fo)
Where: f1 — specified test frequency point, MHz; f1 + AF or f2 -Af, MHz;
4f — frequency increment, MHz;
G,- — power gain corresponding to f1, dB;
G and f2 corresponding to f1, dB.
5.5.4 Test equipment requirements
Test equipment requirements are the same as 5.1.1., 4.
5.5.5 Precautions
a, Precautions are the same as 5.1.1.5;
h. The frequency increment 4f should be small enough.
5.5.6 Test steps
a~e Questions Test steps 5.1.1.6 a~e: f. Corresponding to the specified test frequency f. and f, the corresponding power gains G and GG are measured, which are two values); g, calculated by formula (8), the larger of the two values ​​is recorded as f. The gain slope K at f. 5.5.7 Specified conditions
&. Ambient mirror temperature or reference point temperature;
h, Setting conditions:
c. Input power;
d. Test frequency.
5.6 Out-of-band gain suppression
5.6.1 Under specified conditions, measure the difference between the gain of the microwave amplifier in the specified frequency band outside the operating frequency range and the gain in the band.
5.6.2 Test diagram
The test block diagram is shown in Figure 3.
Isolator
Signal source
5.6.3 Test principle
Variable attenuator
Directional coupler
Figure 3 Out-of-band gain suppression test diagram
Amplifier under test
Power supply
Power attenuator
Under specified input power conditions, the spectrum analyzer directly reads the specified frequency signal output amplitude P (dBm) of the amplifier's operating frequency range and the maximum signal amplitude P (dB) on the specified out-of-band frequency band. 9
SJ 20645-97
The difference between P. and P. is the out-of-band gain suppression of the amplifier, in dR. 5.6.4 Test equipment requirements
a. The dynamic range of the spectrum analyzer meets the test requirements; b. The isolation of the isolator is not less than 20dB. The main path insertion loss and coupling of the directional combiner should be determined in advance. 5.6.5 Notes
When the output power of the amplifier is large, the attenuation of the power attenuator should be increased to prevent damage to the spectrum analyzer. 5.6.6 Test steps
Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency within the band; c. Add the specified bias to the amplifier under test; d. Use the power meter reading limit P to calculate P from formula (1) so that the input power P, applied to the amplifier under test, is the specified value: 6. Continuously change the frequency of the signal source, and read the difference between the maximum signal amplitude within the specified frequency band outside the band and the signal amplitude of the specified frequency within the band on the spectrum analyzer, which is the out-of-band suppression of the amplifier. 5.6.7 Specified conditions
a. Ambient temperature or base point temperature;
b. Bias conditions;
. Specified frequency within the operating frequency range: 5. Input power;
c. Out-of-band frequency band.
5.7 Reverse isolation IS)
Measure the reverse isolation of the microwave amplifier under the specified conditions. 5.7.2 Test diagram
The test block diagram is shown in Figure 1, but the amplifier output end should be connected to directional coupler 1 and the input end should be connected to directional coupler 2.
5.7.3 Test principle
The test principle is the same as 5.1.1.3.
Calculate the reverse isolation ISO (dB) by the following formula: ISO = P: - P.
Where: P. Input power, dB:
P. - output power, dB.
5.7.4 Test equipment requirements
Test equipment requirements are the same as 5.1.1.4.
5.7.5 Precautions
Precautions are the same as 5.1.1.5.
5.7.6 Test steps
a. Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency:: Add the specified bias to the amplifier under test; (9)
TTTKAONKAca-4.2 Method 2
5.4.2.1 Purpose
Measure the difference between the maximum and minimum values ​​of the linear power gain of the microwave amplifier under specified conditions. 5.4.2.2 Test block diagram
The test block diagram is shown in Figure 2.
5.4.2.3 Test principle
Test principle is the same as 5.3.2.3.
Calculate the linear power gain flatness A (cB) by formula (7). 5.4.2.4 Test equipment requirements
Test equipment requirements are the same as 5.1.2.4
5.4.2.5 Precautions
Precautions are the same as 5.1.2.5.
5.4.2.6 Test steps
a. Adjust the temperature to the specified value;
b. Adjust the output frequency of the swept frequency signal source of the scalar network analyzer to the center frequency point of the test frequency range; c. Add the specified bias to the amplifier under test; d. Apply appropriate input power to the amplifier under test; adjust the output of the signal source to change the input power of the amplifier under test and determine the linear region of the amplifier's power gain; e.
or unless otherwise specified, the nominal 1% of the amplifier under test and its gain compression point output power P. ld) corresponding to the input power back-off 15±3dB region is considered the amplifier's linear working region; f. Optional input power in the linear region:
Adjust the output frequency range of the scalar network analyzer's sweep signal source to the specified test frequency range: g
h, on the scalar network analyzer, select the \A/B\ working mode:], on the scalar network analyzer, within the specified frequency range, measure the maximum linear power gain Grinmnxt: minimum linear power gain Glimin: and directly read the linear power gain flatness AGming5.4.2.7 Specified conditions
a: environmental hysteresis or reference point temperature;
h. Bias operation:
. Test frequency range.
5.5 Increase slope K
Under the specified conditions, measure the ratio of the change in the microwave amplifier power gain to the change in frequency. 5.5.2 Test block diagram
The test block diagram is shown in Figure 1.
5.5.3 Test principle
TTKAONKAa-
The test principle is the same as 5.1, 1.3.
SJ20645-97
At the specified frequency f1 and f2 +4f and f2 -4f, respectively measure the power gain of the microwave amplifier, and calculate the gain slope K (dB/MHz) by the following formula:
K = (G.-G.)/(f-fo)
Where: f1 — specified test frequency point, MHz; f1 + AF or f2 -Af, MHz;
4f — frequency increment, MHz;
G,- — power gain corresponding to f1, dB;
G and f2 corresponding to f1, dB.
5.5.4 Test equipment requirements
Test equipment requirements are the same as 5.1.1., 4.
5.5.5 Precautions
a, Precautions are the same as 5.1.1.5;
h. The frequency increment 4f should be small enough.
5.5.6 Test steps
a~e Questions Test steps 5.1.1.6 a~e: f. Corresponding to the specified test frequency f. and f, the corresponding power gains G and GG are measured, which are two values); g, calculated by formula (8), the larger of the two values ​​is recorded as f. The gain slope K at f. 5.5.7 Specified conditions
&. Ambient mirror temperature or reference point temperature;
h, Setting conditions:
c. Input power;
d. Test frequency.
5.6 Out-of-band gain suppression
5.6.1 Under specified conditions, measure the difference between the gain of the microwave amplifier in the specified frequency band outside the operating frequency range and the gain in the band.
5.6.2 Test diagram
The test block diagram is shown in Figure 3.
Isolator
Signal source
5.6.3 Test principle
Variable attenuator
Directional coupler
Figure 3 Out-of-band gain suppression test diagram
Amplifier under test
Power supply
Power attenuator
Under specified input power conditions, the spectrum analyzer directly reads the specified frequency signal output amplitude P (dBm) of the amplifier's operating frequency range and the maximum signal amplitude P (dB) on the specified out-of-band frequency band. 9
SJ 20645-97
The difference between P. and P. is the out-of-band gain suppression of the amplifier, in dR. 5.6.4 Test equipment requirements
a. The dynamic range of the spectrum analyzer meets the test requirements; b. The isolation of the isolator is not less than 20dB. The main path insertion loss and coupling of the directional combiner should be determined in advance. 5.6.5 Notes
When the output power of the amplifier is large, the attenuation of the power attenuator should be increased to prevent damage to the spectrum analyzer. 5.6.6 Test steps
Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency within the band; c. Add the specified bias to the amplifier under test; d. Use the power meter reading limit P to calculate P from formula (1) so that the input power P, applied to the amplifier under test, is the specified value: 6. Continuously change the frequency of the signal source, and read the difference between the maximum signal amplitude within the specified frequency band outside the band and the signal amplitude of the specified frequency within the band on the spectrum analyzer, which is the out-of-band suppression of the amplifier. 5.6.7 Specified conditions
a. Ambient temperature or base point temperature;
b. Bias conditions;
. Specified frequency within the operating frequency range: 5. Input power;
c. Out-of-band frequency band.
5.7 Reverse isolation IS)
Measure the reverse isolation of the microwave amplifier under the specified conditions. 5.7.2 Test diagram
The test block diagram is shown in Figure 1, but the amplifier output end should be connected to directional coupler 1 and the input end should be connected to directional coupler 2.
5.7.3 Test principle
The test principle is the same as 5.1.1.3.
Calculate the reverse isolation ISO (dB) by the following formula: ISO = P: - P.
Where: P. Input power, dB:
P. - output power, dB.
5.7.4 Test equipment requirements
Test equipment requirements are the same as 5.1.1.4.
5.7.5 Precautions
Precautions are the same as 5.1.1.5.
5.7.6 Test steps
a. Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency:: Add the specified bias to the amplifier under test; (9)
TTTKAONKAca-7 Specified conditions
a: ambient temperature or reference point temperature;
h. Bias operation:
. Test frequency range.
5.5 Gain slope K
Measure the ratio of the change in power gain of the microwave amplifier to the change in frequency under the specified conditions. 5.5.2 Test block diagram
The test block diagram is shown in Figure 1.
5.5.3 Test principle
TTKAONKAa-
The test principle is the same as 5.1, 1.3.
SJ20645-97
Measure the power gain of the microwave amplifier at the specified frequency f. and frequency f. +4f and f. -4f, respectively, and calculate the gain slope K (dB/MHz) by the following formula:
K = (G.-G.)/(f-fo)
Where: f. —Specified test frequency point, MHz: Jf.+AF or f. -Af, MHz;
4f—frequency increment, MHz;
G,-—corresponding power gain, dB;
G and. Corresponding power gain, dB.
5.5.4 Test equipment requirements
Test equipment requirements are the same as 5.1.1., 4.
5.5.5 Notes
a, notes are the same as 5.1.1.5;
h. The frequency increment 4f should be small enough.
5.5.6 Test steps
a~e Question Test steps 5.1.1.6 a~e: f. Corresponding to the specified test frequencies f. and f, the corresponding power gains G and GG are measured, which are two values); g, calculated by formula (8), the larger of the two values ​​is recorded as f. The gain slope K at the position. 5.5.7 Specified conditions
&. Ambient mirror temperature or reference point temperature;
h. Programming conditions:
c. Input power;
d. Test frequency.
5.6 Out-of-band gain suppression
5.6.1 Under specified conditions, measure the difference between the gain of the microwave amplifier in the specified frequency band outside the operating frequency range and the gain in the band.
5.6.2 Test diagram
The test block diagram is shown in Figure 3.
Isolator
Signal source
5.6.3 Test principle
Variable attenuator
Directional coupler
Figure 3 Out-of-band gain suppression test diagram
Amplifier under test
Power supply
Power attenuator
Under the specified input power condition, the spectrum analyzer directly reads the specified frequency signal output amplitude P1 (dBm) of the working frequency range of the amplifier and the maximum signal amplitude P (dB) on the specified out-of-band frequency band. 9
SJ 20645-97
The difference between P1 and P2 is the out-of-band gain suppression of the amplifier, in dR. 5.6.4 Test equipment requirements
a. The dynamic range of the spectrum analyzer meets the test requirements; b. The isolation of the isolator is not less than 20dB. The main line insertion loss and coupling degree of the directional coupler should be determined in advance. 5.6.5 Precautions
When the output power of the amplifier is large, the attenuation of the power attenuator should be increased to prevent damage to the spectrum analyzer. 5.6.6 Test steps
Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency within the band; c. Add the specified bias to the amplifier under test; d. Use the power meter to read the limit P and calculate P by formula (1) so that the input power P applied to the amplifier under test is the specified value: 6. Continuously change the frequency of the signal source, and read the difference between the maximum signal amplitude within the specified frequency band outside the band and the signal amplitude of the specified frequency within the band on the spectrum analyzer, which is the amplifier's out-of-band gain suppression degree. 5.6.7 Specified conditions
a. Ambient temperature or base point temperature;
b. Bias conditions;
. Specified frequency within the operating frequency range: 5, input power;
c. Out-of-band frequency band.
5.7 Reverse isolation ISO)
5.7.1 The reverse isolation of the microwave amplifier is measured under the specified conditions. 5.7.2 Test diagram
The test block diagram is shown in Figure 1, but the amplifier output end should be connected to directional coupler 1 and the input end should be connected to directional coupler 2.
5.7.3 Test principle
The test principle is the same as 5.1.1.3.
The reverse isolation ISO (dB) is calculated by the following formula: ISO = P: - P.
Where: P. input power, dB:
P. - output power, dB.
5.7.4 Test equipment requirements
The test equipment requirements are the same as 5.1.1.4.
5.7.5 Precautions
Precautions are the same as those in 5.1.1.5.
5.7.6 Test steps
a. Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency:: Add the specified bias to the amplifier under test; (9)
TTTKAONKAca-7 Specified conditions
a: ambient temperature or reference point temperature;
h. Bias operation:
. Test frequency range.
5.5 Gain slope K
Measure the ratio of the change in power gain of the microwave amplifier to the change in frequency under the specified conditions. 5.5.2 Test block diagram
The test block diagram is shown in Figure 1.
5.5.3 Test principle
TTKAONKAa-
The test principle is the same as 5.1, 1.3.
SJ20645-97
Measure the power gain of the microwave amplifier at the specified frequency f. and frequency f. +4f and f. -4f, respectively, and calculate the gain slope K (dB/MHz) by the following formula:
K = (G.-G.)/(f-fo)
Where: f. —Specified test frequency point, MHz: Jf.+AF or f. -Af, MHz;
4f—frequency increment, MHz;
G,-—corresponding power gain, dB;
G and. Corresponding power gain, dB.
5.5.4 Test equipment requirements
Test equipment requirements are the same as 5.1.1., 4.
5.5.5 Notes
a, notes are the same as 5.1.1.5;
h. The frequency increment 4f should be small enough.
5.5.6 Test steps
a~e Question Test steps 5.1.1.6 a~e: f. Corresponding to the specified test frequencies f. and f, the corresponding power gains G and GG are measured, which are two values); g, calculated by formula (8), the larger of the two values ​​is recorded as f. The gain slope K at the position. 5.5.7 Specified conditions
&. Ambient mirror temperature or reference point temperature;
h. Programming conditions:
c. Input power;
d. Test frequency.
5.6 Out-of-band gain suppression
5.6.1 Under specified conditions, measure the difference between the gain of the microwave amplifier in the specified frequency band outside the operating frequency range and the gain in the band.
5.6.2 Test diagram
The test block diagram is shown in Figure 3.
Isolator
Signal source
5.6.3 Test principle
Variable attenuator
Directional coupler
Figure 3 Out-of-band gain suppression test diagram
Amplifier under test
Power supply
Power attenuator
Under the specified input power condition, the spectrum analyzer directly reads the specified frequency signal output amplitude P1 (dBm) of the working frequency range of the amplifier and the maximum signal amplitude P (dB) on the specified out-of-band frequency band. 9
SJ 20645-97
The difference between P1 and P2 is the out-of-band gain suppression of the amplifier, in dR. 5.6.4 Test equipment requirements
a. The dynamic range of the spectrum analyzer meets the test requirements; b. The isolation of the isolator is not less than 20dB. The main line insertion loss and coupling degree of the directional coupler should be determined in advance. 5.6.5 Precautions
When the output power of the amplifier is large, the attenuation of the power attenuator should be increased to prevent damage to the spectrum analyzer. 5.6.6 Test steps
Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency within the band; c. Add the specified bias to the amplifier under test; d. Use the power meter to read the limit P and calculate P by formula (1) so that the input power P applied to the amplifier under test is the specified value: 6. Continuously change the frequency of the signal source, and read the difference between the maximum signal amplitude within the specified frequency band outside the band and the signal amplitude of the specified frequency within the band on the spectrum analyzer, which is the amplifier's out-of-band gain suppression degree. 5.6.7 Specified conditions
a. Ambient temperature or base point temperature;
b. Bias conditions;
. Specified frequency within the operating frequency range: 5, input power;
c. Out-of-band frequency band.
5.7 Reverse isolation ISO)
5.7.1 The reverse isolation of the microwave amplifier is measured under the specified conditions. 5.7.2 Test diagram
The test block diagram is shown in Figure 1, but the amplifier output end should be connected to directional coupler 1 and the input end should be connected to directional coupler 2.
5.7.3 Test principle
The test principle is the same as 5.1.1.3.
The reverse isolation ISO (dB) is calculated by the following formula: ISO = P: - P.
Where: P. input power, dB:
P. - output power, dB.
5.7.4 Test equipment requirements
The test equipment requirements are the same as 5.1.1.4.
5.7.5 Precautions
Precautions are the same as those in 5.1.1.5.
5.7.6 Test steps
a. Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency:: Add the specified bias to the amplifier under test; (9)
TTTKAONKAca-6. Continuously change the frequency of the signal source, and read the difference between the maximum signal amplitude within the specified frequency band outside the band and the signal amplitude of the specified frequency within the band on the spectrum analyzer, which is the out-of-band suppression of the amplifier. 5.6.7 Specified conditions
a. Ambient temperature or base point temperature;
b. Bias conditions;
. Specified frequency within the operating frequency range: 5. Input power;
c. Out-of-band frequency band.
5.7 Reverse isolation IS)
Measure the reverse isolation of the microwave amplifier under the specified conditions. 5.7.2 Test diagram
The test block diagram is shown in Figure 1, but the amplifier output end should be connected to directional coupler 1 and the input end should be connected to directional coupler 2.
5.7.3 Test principle
The test principle is the same as 5.1.1.3.
Calculate the reverse isolation ISO (dB) by the following formula: ISO = P: - P.
Where: P. Input power, dB:
P. - output power, dB.
5.7.4 Test equipment requirements
Test equipment requirements are the same as 5.1.1.4.
5.7.5 Precautions
Precautions are the same as 5.1.1.5.
5.7.6 Test steps
a. Adjust the temperature to the specified value;
b. Adjust the output frequency of the signal source to the specified test frequency:: Add the specified bias to the amplifier under test; (9)
TTTKAONKAca-6. Continuously change the frequency of the signal source, and read the difference between the maximum signal amplitude within the specified frequency band outside the band and the signal amplitude of the specified frequency within the band on the spectrum analyzer, which is the out-of-band suppression of the amplifier. 5.6.7 Specified conditions
a. Ambient temperature or base point temperature;
b. Bias conditions;
. Specified frequency within the operating frequency range: 5. Input power;
c. Out-of-band frequency band.
5.7 Reverse isolation IS)
Measure the reverse isolation of the microwave amplifier under the specified conditions. 5.7.2 Test diagram
The test block diagram is shown in Figure 1, but the amplifier output end should be connected to directional coupler 1 and the input end should be connected to directional coupler 2.
5.7.3 Test principle
The test principle is the same as 5.1.1.3.
Calculate the reverse isolation ISO (dB) by the following formula: ISO = P: - P.
Where: P. Input power, dB:
P. - output power, dB.
5.7.4 Test equipment requirements
Test equipment requirements are the same as 5.1.1.4.
5.7.5 Precautions
Precautions are the same as 5.1.1.5.
5.7.6 Test steps
a. Adjust the temperature to the specified value;
b. Adjust the output frequency
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.