CN112946461B - Method and device for testing linearity of active calibration body power amplifier - Google Patents
Method and device for testing linearity of active calibration body power amplifier Download PDFInfo
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Abstract
The invention relates to a linearity testing technology of a ground active scaling body power amplifier. The invention discloses a method for testing the linearity of an active calibration body power amplifier, which comprises the following steps: step S1, controlling the signal source to output the radio frequency signal with step-by-step power change, and reading the power of the radio frequency signal by using the frequency spectrograph to obtain the combined range error of the signal source and the frequency spectrograph; step S2, controlling the signal source to output the radio frequency signal with step-by-step power change again, amplifying by using the power amplifier to be tested, reading the power value of the output signal of the power amplifier by using the frequency spectrograph, and obtaining a linearity test value of the power amplifier; and step S3, calculating the actual linearity error value of the power amplifier by using the test results of the steps S1 and S2. In the linearity testing device for the power amplifier of the active calibration body, a computer is respectively connected with a signal source and a frequency spectrograph, and the signal source, the adjustable attenuator, the power amplifier to be tested, the high-power attenuator and the frequency spectrograph are sequentially connected.
Description
Technical Field
The invention relates to the technical field of satellite-borne radars, in particular to a linearity testing technology of a ground active calibration body power amplifier used in an in-orbit antenna directional diagram calibration process of a satellite-borne radar.
Background
When the ground active calibration body is used for calibrating an on-orbit antenna directional diagram of a satellite-borne radar, high-precision calibration of the antenna directional diagram within a range of more than 40dB needs to be realized, and as the active calibration body, stable RCS simulation needs to be realized within a dynamic range of more than 40dB, which puts high requirements on the linearity of the active calibration body.
The power amplifier can realize high-power amplification of a calibration signal, so that a high signal-to-noise ratio signal is generated, which is necessary for an active calibration body, but due to the non-linear effect of the power amplifier, especially a non-linear region near a 1dB compression point, if the active calibration signal falls in the region, a given calibration brings a larger error, so that the calibration accuracy of an antenna directional diagram is reduced, so that a power amplifier linearity test needs to be carried out, and the region with the best linearity is used for calibration or the linearity value obtained through the test is used for later calibration compensation, so that the calibration accuracy is improved.
At present, a power meter is generally adopted for power testing, but the dynamic range of the power meter is limited, the high-precision testing of the power value within about 30dB range can be generally realized, and the linearity testing requirement of an active calibration body power amplifier is difficult to meet.
Therefore, in view of the above disadvantages, it is desirable to provide a ground active scaler power amplifier linearity test technique with a large dynamic range.
Disclosure of Invention
The technical problem to be solved by the invention is that the dynamic range of a power meter adopted by the existing ground active calibration body power amplifier linearity testing method is small, the linearity testing requirement of an active calibration body power amplifier cannot be met, and a novel active calibration body power amplifier linearity testing method and a novel active calibration body power amplifier linearity testing device are provided aiming at the defects in the prior art.
In order to solve the above technical problem, the present invention provides a method for testing linearity of an active calibration body power amplifier, wherein the method comprises:
step S1, controlling the signal source to output the radio frequency signal with step-by-step power change, and reading the power of the radio frequency signal by using the frequency spectrograph to obtain the combined range error of the signal source and the frequency spectrograph;
step S2, controlling the signal source to output the radio frequency signal with step-by-step power change again, amplifying the radio frequency signal by using an active calibration body power amplifier to be tested, and reading the power value of the output signal of the power amplifier in sequence by using a frequency spectrograph to obtain a linearity test value of the power amplifier;
and step S3, subtracting the joint range error of the signal source and the frequency spectrograph by using the linearity test value of the power amplifier to obtain the actual linearity error value of the power amplifier.
Optionally, in step S2, the amplifying the radio frequency signal by using the active scale power amplifier to be tested includes:
attenuating the signal output by the signal source by using an adjustable attenuator to enable the attenuated power to be positioned near a P-1 power value of the active scaling power amplifier to be tested;
and amplifying the output signal of the adjustable attenuator by using the active scaling body power amplifier to be tested.
Optionally, in step S2, sequentially reading the power values of the output signals of the power amplifiers by using a spectrometer includes:
attenuating the output signal of the power amplifier by using a high-power attenuator so that the attenuated power is positioned at the range Pso of the frequency spectrograph 1 Within 1 dB;
and sequentially reading the power values of the output signals of the high-power attenuator by using a frequency spectrograph.
Optionally, in the step S1 and the step S2, the step size of the change of the output power of the signal source is 0.1 dB.
Optionally, in the steps S1 and S2, the spectrometer continuously reads M times of power values every time the signal source changes the output power, and an average value of the M times of power values is used as the power value read by the spectrometer.
Optionally, in step S1, the ith power value output by the signal source is P i I 1, 2, … …, N > 400, the sum of the signals read by the spectrometer and P i Corresponding power value of Pso i ，
Single point links (links generally referring to something other than test equipment)All branches to be measured or electrical circuits to be measured) difference value Is i Comprises the following steps:
Is i ＝Pso i -P i
the link difference value Is:
Is＝(Is 1 +Is 2 +……+Is 10 )/10
joint range error deltas of signal source and frequency spectrograph i Comprises the following steps:
δs i ＝Is i -Is。
optionally, in step S2, the ith power value output by the signal source is P i I is 1, 2, … …, N > 400, the sum of the signals read by the spectrometer and P i (Here P i Has the same value as Pi in the process of calibrating the combined range error of the signal source and the frequency spectrograph) is Po i ，
Single point link relative gain G i Comprises the following steps:
G i ＝Po i -P i
ideal relative gain G c Comprises the following steps:
G c ＝(G 21 +G 22 +……+G 30 )/10
linear gain error delta ci Comprises the following steps:
δ ci ＝G i -G c
and taking the linear gain error as a linearity test value of the power amplifier.
The invention also provides a device for testing the linearity of the power amplifier of the active calibration body, which comprises a computer, a signal source, an adjustable attenuator, a high-power attenuator and a frequency spectrograph;
the signal source is connected with the computer and used for outputting radio frequency signals with power changing in a stepping mode under the control of the computer;
the frequency spectrograph is connected with the computer and used for recording the read power value under the control of the computer;
when the device is adopted to measure the joint range error of the signal source and the frequency spectrograph:
the frequency spectrograph is also connected with the signal source and used for measuring the power value of the signal output by the signal source;
when the device is used for measuring the linearity test value of the active calibration body power amplifier:
the adjustable attenuator is connected with the signal source and is used for attenuating the signal output by the signal source;
the power amplifier is connected with the adjustable attenuator and is used for amplifying the signal output by the adjustable attenuator;
the high-power attenuator is connected with the power amplifier and is used for attenuating the signal output by the power amplifier;
the frequency spectrograph is also connected with the high-power attenuator and is used for measuring the power value of the output signal of the high-power attenuator.
Optionally, the computer is embedded with the following modules:
the first control module is configured to control the signal source to output a radio-frequency signal with step-by-step power change and control the frequency spectrograph to record the read power of the radio-frequency signal;
a joint range error calculation module configured to calculate a joint range error according to the formula δ s i ＝Is i Is calculating the joint range error deltas of the signal source and the frequency spectrograph i Wherein Is i Is a single point link difference value i ＝Pso i -P i ，P i The ith power value, Pso, outputted for the signal source i Read by the frequency spectrograph and the P i Corresponding power value Is link difference value Is ═ Is (Is) 1 +Is 2 +……+Is 10 )/10；
The second control module is configured to control the signal source to output a radio-frequency signal with step-by-step power change and control the frequency spectrograph to record the read power of the radio-frequency signal;
a linearity test value calculation module configured to use a formula delta ci ＝G i -G c Calculating the saidLinearity test value delta of power amplifier ci Wherein G is i For single point link relative gain, G i ＝Po i -P i ，P i The ith power value, Po, output by the signal source after the second control module is started i Read by the frequency spectrograph and the P after the second control module is started i Corresponding power value, G c ＝(G 21 +G 22 +……+G 30 ) 10; and
an actual linearity error value calculation module configured to utilize a formula δ i ＝δ ci -δs i Calculating an actual linearity error value delta of a power amplifier i 。
The method and the device for testing the linearity of the active calibration body power amplifier have the following beneficial effects: the large dynamic range linearity test of the active calibration body power amplifier can be realized.
Drawings
Fig. 1 is a schematic flow chart of a method for testing linearity of an active scaler power amplifier according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an apparatus used in step S1 in the first embodiment of the present invention;
fig. 3 is a schematic structural diagram of an apparatus used in step S2 in the first embodiment of the present invention;
fig. 4 is a test curve of the linearity of the active scaler power amplifier according to an embodiment of the present invention.
In the figure: 1: a signal source; 2: an adjustable attenuator; 3: a power amplifier; 4: a high power attenuator; 5: a frequency spectrograph; 6: and (4) a computer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example one
As shown in fig. 1, the method for testing the linearity of the active-scaled body power amplifier according to the embodiment of the present invention includes the following steps S1 to S3.
And step S1, controlling the signal source to output the radio frequency signal with the power changing in a stepping way, and reading the power of the radio frequency signal by using the frequency spectrograph to obtain the combined range error of the signal source and the frequency spectrograph.
In order to adapt to the application with a large dynamic range, different attenuation gears are configured inside the signal source 1 and the spectrometer 5, and in the application of the test with a large dynamic range, a range error is caused by the change of the attenuation gears, and the range error needs to be calibrated, and the calibration process is as shown in the step S1.
The step S1 only needs the signal source 1, the spectrometer 5 and the computer 6, and the adopted device structure is as shown in fig. 2. The frequency spectrograph 5 configures a sweep width (span) parameter of 100KHz and a Resolution Bandwidth (RBW) and Video Bandwidth (VBW) parameter of 1KHz under the control of the control computer 6. The signal source 1 is used for generating a radio frequency signal with linear step change of power under the control of the computer 6, the power of the radio frequency signal is gradually reduced (or gradually increased) according to 0.1dB step, and the ith power value of the radio frequency signal is marked as P i (i ═ 1, 2, … …, N > 400). In this embodiment, the parameters including the lower subscript i all correspond to the ith power value of the rf signal. When the signal source 1 changes the output power value once, the spectrometer 5 continuously reads M times of data, averages the M data and records the average as the test value of the current output power of the signal source 1, for example, the output power value of the signal source 1 is P i The average value of M times of data read continuously by the spectrometer 5 is Pso i ，Pso i I.e. the test value of the current output power of the signal source 1.
The difference value of the single-point link corresponding to the ith power value of the radio-frequency signal Is i ＝Pso i -P i (i is 1, 2, … …, N > 400), the signal source output linearity is good, so theoretically, a single-point link difference corresponding to a plurality of power values can be randomly selected for carrying outAveraging, but affected by the noise of the spectrometer, as the output power of the signal source decreases, the signal-to-noise ratio of the test signal of the spectrometer decreases, and the error increases, so that the single-point link difference corresponding to the first 10 power values is selected for calculation in this embodiment. Is taking 1 To Is 10 Averaging to obtain link difference value Is (Is) 1 +Is 2 +……+Is 10 )/10。
The joint error of the signal source and the frequency spectrograph is deltas i ＝Is i -Is(i＝1、2、……、N，N＞400)。
And step S2, controlling the signal source to output the radio frequency signal with the step-by-step power change again, amplifying the radio frequency signal by using the active calibration body power amplifier to be tested, and sequentially reading the power value of the output signal of the power amplifier by using a frequency spectrograph to obtain the linearity test value of the power amplifier.
The apparatus structure adopted in step S2 is shown in fig. 3. In the above step S2, the signal source 1 still outputs the rf signal with linear step change of power under the control of the computer 6, the power of the rf signal gradually decreases (or gradually increases) according to the step of 0.1dB, and the ith power value of the rf signal is denoted as P i (i ═ 1, 2, … …, N > 400). The adjustable attenuator 2 adjusts the power output by the signal source 1, so that the power input to the power amplifier 3 is just close to the P-1 power value of the power amplifier 3 (the P-1 power value is also called as a 1dB compression point, which is defined as inputting a single-frequency signal to the power amplifier, continuously increasing the power of the single-frequency signal until the output power of the power amplifier is reduced by 1dB compared with the linear amplification, the corresponding point is a 1dB compression point, and the input power at the moment is called as the power of the input 1dB compression point, namely the P-1 power value); the power amplifier 3 amplifies the radio frequency signal output by the adjustable attenuator 2 and outputs a high-power signal; the high-power attenuator 4 is connected with the output port of the power amplifier 3 and attenuates the high-power signal to the measuring range Pso of the frequency spectrograph 5 1 Near or range Pso 1 In the 1dB range (Pso) 1 Indicating the maximum value of the spectrum range in step S1); the spectrometer 5 configures span parameters of 100KHz and RBW and VBW parameters of 1KHz under the control of the computer 6. SignalWhen the power value outputted by the source 1 changes once, the spectrometer 5 continuously reads M times of data, averages the M data and records the average data as the test value of the current output power of the signal source 1, for example, the power value outputted by the signal source 1 is P i The average value of M times of data read by the spectrometer 5 is Po i (i ═ 1, 2, … …, N > 400), Poi is the test value of the current output power of the signal source 1.
The relative gain of the single-point link corresponding to the ith power value of the radio frequency signal is G i ＝Po i -P i (i ═ 1, 2, … …, N > 400). Because the linearity of the amplifier near the 1dB compression point is not ideal, the point near the 1dB compression point is selected as a point with larger gain value error, and the amplifier enters a linear region with ideal gain value after returning by 10dB, so that the embodiment selects the 21 st point to the 30 th point to average as an ideal relative gain value, in fact, the 21 st point can be arbitrarily selected, but due to the noise influence of a spectrometer, the points in the middle upper region are selected as much as possible to average, and the error influence is reduced. Get G 21 To G 30 These 10 data are averaged to obtain an ideal relative gain of G c ＝(G 21 +G 22 +……+G 30 )/10。
The linear gain error corresponding to the ith power value of the RF signal is delta ci ＝G i -G c (i ═ 1, 2, … …, N > 400), and the linearity gain error is the power amplifier linearity test value.
And step S3, subtracting the joint range error of the signal source and the frequency spectrograph by using the linearity test value of the power amplifier to obtain the actual linearity error value of the power amplifier.
The above step S3 is to calibrate the linearity. The actual linearity error value of the power amplifier corresponding to the ith power value of the radio frequency signal is delta i (i ═ 1, 2, … …, N > 400), then,
δ i ＝δ ci -δs i
the linearity of the power amplifier is tested by adopting the method for testing the linearity of the power amplifier of the active scaling body, and the test result is shown in figure 4. Assuming that the required linearity of the power amplifier is δ, the curve a is + δ, the curve B is- δ, and the curve C is the actually measured linearity error curve of the amplifier, it can be visually observed through fig. 4 whether all the tested points meet the linearity error requirement.
As shown in fig. 3, the present embodiment further provides an apparatus for testing linearity of an active calibration body power amplifier, where the apparatus includes a computer 6, a signal source 1, an adjustable attenuator 2, a high-power attenuator 4, and a spectrometer 5;
the signal source 1 is connected with the computer 6 and is used for outputting a radio frequency signal with power changing step by step under the control of the computer 6;
the frequency spectrograph 5 is connected with the computer 1 and used for recording the read power value under the control of the computer 6;
when the device is adopted to measure the combined range error of the signal source and the frequency spectrograph:
the frequency spectrograph 5 is also connected with the signal source 1 and is used for measuring the power value of the signal output by the signal source 1;
when the device is used for measuring the linearity test value of the active calibration body power amplifier:
the adjustable attenuator 2 is connected with the signal source 1 and is used for attenuating the signal output by the signal source 1;
the power amplifier 3 is connected with the adjustable attenuator and is used for amplifying the signal output by the adjustable attenuator 2;
the high-power attenuator 4 is connected with the power amplifier 3 and is used for attenuating the signal output by the power amplifier 3;
the spectrometer 5 is also connected with the high power attenuator 4 and is used for measuring the power value of the output signal of the high power attenuator 4.
The linearity test of the power amplifier of the active calibration body is carried out by adopting the device according to the following three steps:
the method comprises the following steps: signal source and spectrometer range error calibration
Connecting a radio frequency output port of a signal source 1 and a radio frequency input port of a spectrometer 5 by a radio frequency cable, controlling the signal source 1 to sequentially output radio frequency signals with power changing in a stepping way by a computer 6, controlling the spectrometer 5 to read power values, and calculating according to a corresponding formula to obtain a combined range error of the signal source and the spectrometer (see the step S1);
step two: active calibration body power amplifier linearity test
According to the figure 2, a signal source 1, an adjustable attenuator 2, a power amplifier 3 to be tested, a high-power attenuator 4 and a frequency spectrograph 5 are sequentially connected, the power amplifier 3 to be tested is placed in an environment with relatively stable temperature, and the power amplifier is started and preheated for 30 minutes;
the computer 6 controls the signal source 1 to output the radio frequency signal with the power changing step by step to the radio frequency input port of the power amplifier 3, and the radio frequency signal is gradually reduced according to the preset step power;
the computer 6 controls the frequency spectrograph 5 to sequentially read the power values of the output signals of the high-power attenuator 4;
calculating according to a corresponding formula to obtain a linearity test value of the power amplifier (see the step S2);
step three: linearity calibration
And (4) subtracting the joint range error of the signal source and the frequency spectrograph obtained in the step one from the linearity test value obtained in the step two to obtain an actual linearity error value of the active calibration body power amplifier (see the step S3).
As a preferred embodiment of the present application, the computer 6 is embedded with the following modules:
the first control module is configured to control the signal source to output a radio-frequency signal with step-by-step power change and control the frequency spectrograph to record the read power of the radio-frequency signal;
a joint range error calculation module configured to calculate a joint range error according to the formula δ s i ＝Is i Is calculating the joint range error deltas of the signal source and the frequency spectrograph i Wherein Is i Is a single point link difference value i ＝Pso i -P i ，P i The ith power value, Pso, outputted for the signal source i Read for the spectrometerAnd said P i Corresponding power value Is link difference value Is ═ Is (Is) 1 +Is 2 +……+Is 10 )/10；
The second control module is configured to control the signal source to output a radio-frequency signal with step-by-step power change and control the frequency spectrograph to record the read power of the radio-frequency signal;
a linearity test value calculation module configured to use a formula delta ci ＝G i -G c Calculating the linearity test value delta of the power amplifier ci Wherein G is i For single point link relative gain, G i ＝Po i -P i ，P i The ith power value, Po, output by the signal source after the second control module is started i Read by the frequency spectrograph and the P after the second control module is started i Corresponding power value, G c ＝(G 21 +G 22 +……+G 30 ) 10; and
an actual linearity error value calculation module configured to utilize a formula δ i ＝δ ci -δs i Calculating an actual linearity error value delta of a power amplifier i 。
The modules can execute the steps of the method for testing the linearity of the active-scaled body power amplifier of the embodiment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for testing linearity of an active scaler power amplifier is characterized by comprising the following steps:
step S1, controlling the signal source to output the radio frequency signal with step-by-step power change, and reading the power of the radio frequency signal by using the frequency spectrograph to obtain the combined range error of the signal source and the frequency spectrograph;
step S2, controlling the signal source to output the radio frequency signal with step-by-step power change again, amplifying the radio frequency signal by using an active calibration body power amplifier to be tested, and reading the power value of the output signal of the power amplifier in sequence by using a frequency spectrograph to obtain a linearity test value of the power amplifier;
step S3, subtracting the joint range error of the signal source and the frequency spectrograph by using the linearity test value of the power amplifier to obtain the actual linearity error value of the power amplifier;
in step S1, the ith power value output by the signal source is P i I 1, 2, … …, N > 400, the sum of the signals read by the spectrometer and P i Corresponding power value of Pso i ，
Single point link difference Is i Comprises the following steps:
Is i ＝Pso i -P i
the link difference value Is:
Is＝(Is 1 +Is 2 +……+Is 10 )/10
joint range error deltas of signal source and frequency spectrograph i Comprises the following steps:
δs i ＝Is i -Is；
in step S2, the ith power value output by the signal source is P i I 1, 2, … …, N > 400, the sum of the signals read by the spectrometer and P i Corresponding power value is Po i ，
Single point link relative gain G i Comprises the following steps:
G i ＝Po i -P i
ideal relative gain G c Comprises the following steps:
G c ＝(G 21 +G 22 +……+G 30 )/10
linear gain error delta ci Comprises the following steps:
δ ci ＝G i -G c
and taking the linear gain error as a linearity test value of the power amplifier.
2. The method of claim 1, wherein the step S2 of amplifying the rf signal with an active-sealer power amplifier to be tested comprises:
attenuating the signal output by the signal source by using an adjustable attenuator to enable the attenuated power to be positioned near a P-1 power value of the active scaling power amplifier to be tested;
and amplifying the output signal of the adjustable attenuator by using the active scaling body power amplifier to be tested.
3. The method according to claim 1, wherein the step S2 of sequentially reading the power values of the output signals of the power amplifiers by using a spectrometer comprises:
attenuating the output signal of the power amplifier by using a high-power attenuator so that the attenuated power is positioned at the range Pso of the frequency spectrograph 1 Within 1 dB;
and sequentially reading the power values of the output signals of the high-power attenuator by using a frequency spectrograph.
4. The method of claim 1, wherein the step size of the variation of the output power of the signal source in steps S1 and S2 is 0.1 dB.
5. The method of claim 1, wherein: in the steps S1 and S2, each time the signal source changes the output power, the spectrometer continuously reads M times of power values, and the average value of the M times of power values is used as the power value read by the spectrometer.
6. The linearity testing device of the power amplifier of the active calibration body is characterized by comprising a computer, a signal source, an adjustable attenuator, a high-power attenuator and a frequency spectrograph, wherein the signal source is connected with the signal source;
the signal source is connected with the computer and used for outputting a radio frequency signal with power changing in a stepping way under the control of the computer;
the frequency spectrograph is connected with the computer and used for recording the read power value under the control of the computer;
when the device is adopted to measure the combined range error of the signal source and the frequency spectrograph:
the frequency spectrograph is also connected with the signal source and used for measuring the power value of the signal output by the signal source;
when the device is used for measuring the linearity test value of the active calibration body power amplifier:
the adjustable attenuator is connected with the signal source and is used for attenuating the signal output by the signal source;
the power amplifier is connected with the adjustable attenuator and is used for amplifying the signal output by the adjustable attenuator;
the high-power attenuator is connected with the power amplifier and is used for attenuating the signal output by the power amplifier;
the frequency spectrograph is also connected with the high-power attenuator and is used for measuring the power value of the output signal of the high-power attenuator;
the computer is embedded with the following modules:
the first control module is configured to control the signal source to output a radio-frequency signal with step-by-step power change and control the frequency spectrograph to record a read power value of the radio-frequency signal;
a joint range error calculation module configured to calculate a joint range error according to the formula δ s i ＝Is i Is calculating the joint range error deltas of the signal source and the frequency spectrograph i Wherein Is i Is a single point link difference value i ＝Pso i -P i ，P i An ith power value, Pso, output for the signal source i Read by the frequency spectrograph and the P i Corresponding power value Is link difference value Is ═ Is (Is) 1 +Is 2 +……+Is 10 )/10；
The second control module is configured to control the signal source to output a radio-frequency signal with step-by-step power change and control the frequency spectrograph to record the read power of the radio-frequency signal;
a linearity test value calculation module configured to use a formula delta ci ＝G i -G c Calculating the linearity test value delta of the power amplifier ci Wherein G is i For single point link relative gain, G i ＝Po i -P i ，P i The ith power value, Po, output by the signal source after the second control module is started i Read by the frequency spectrograph and the P after the second control module is started i Corresponding power value, G c ＝(G 21 +G 22 +……+G 30 ) 10; and
an actual linearity error value calculation module configured to utilize a formula δ i ＝δ ci -δs i Calculating an actual linearity error value delta of a power amplifier i 。
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| CN101141134A (en) * | 2007-10-19 | 2008-03-12 | 深圳国人通信有限公司 | Software compensation method of radio frequency module performance and improved radio frequency module |
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