CN101256214B - Self-adapting testing system and method for radio-frequency power amplifier - Google Patents
Self-adapting testing system and method for radio-frequency power amplifier Download PDFInfo
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Abstract
The invention provides an adaptive testing system of radio frequency power amplifier, comprising environment experiment box, testing apparatus unit, switch switching unit and PC mainframe, wherein the testing apparatus unit is respectively connected with the PC mainframe and switch switching unit. The switch switching unit and the environment experiment box are respectively connected with PC mainframe. The PC mainframe and switch switching unit are circumscribed with a power amplifier. The invention also provides a testing method using the said system. The adaptive testing system has features of simple structure and convenient operation and greatly increases the work efficiency and measuring accuracy.
Description
Technical field
The present invention relates to the instrument and meter field tests, particularly a kind of radio-frequency power amplifier adaptive testing system and method for testing thereof.
Background technology
Radio-frequency power amplifier (hereinafter to be referred as power amplifier) is a kind of comparatively widely electronic product of current utilization.But when variation of ambient temperature was very big, the hardware circuit characteristic of power amplifier can change thereupon, and this can cause bigger influence to the performance of power amplifier.In order to overcome this influence, the performance of power amplifier is consistent under different temperatures as far as possible, must when the design of power amplifier, add temperature-compensation circuit.When the temperature of environment changes, detect the temperature change value of prevailing circumstances by the temperature sensor in the temperature-compensation circuit, single-chip microcomputer in the power amplifier is then according to detected temperature change value, correspondingly export a control voltage, the quality of signals of power amplifier output and quality of signals that power amplifier is exported at normal temperatures are consistent.But the Changing Pattern of this control voltage obtains by summing up experimental data.
At present, in order to obtain the Changing Pattern of this control voltage, generally the method for Cai Yonging is that tested power amplifier is placed in the environmental experiment case, by artificial rising or reduce temperature in the environmental experiment case and simulate different high and low temperature environment in the actual environment, and pass through the manual adjustment single-chip microcomputer of tester and export the size of controlling voltage, requirement when making the performance of the power amplifier under the different temperatures reach normal temperature, thus sum up Changing Pattern.Therefore, the method for this manual detection has the following disadvantages: (1) needs consumption tester a large amount of working time, efficient lower; (2) be subjected to the restriction of tester's testing level, can produce bigger error.
Summary of the invention
Purpose of the present invention is exactly in order to overcome above-mentioned technical deficiency, and a kind of radio-frequency power amplifier adaptive testing system is provided, and this system can not only save a large amount of test durations, improves testing efficiency, and can also improve the precision of test significantly.
Another object of the present invention provides a kind of method of testing that adopts above-mentioned radio-frequency power amplifier adaptive testing system to be realized.
Purpose of the present invention realizes by following proposal: the method for testing of a kind of radio-frequency power amplifier adaptive testing system may further comprise the steps:
(1) in advance the environment temperature of power amplifier work is made as predetermined value, sets the desired value G0 of the gain performance index parameter of power amplifier output signal simultaneously, and start test macro;
(2) PC host computer control switch switching unit switches to change-over switch on first tested power amplifier, reads the control voltage initial value V " and relevant characters initial parameter value G " that stores in this power amplifier simultaneously; The PC main frame is controlled testing instrument unit again and is generated radiofrequency signal, and the PC main frame reads current control magnitude of voltage V ' and the corresponding current performance index parameter value G ' in tested power amplifier this moment simultaneously;
(3) system is with the numerical value substitution adaptive algorithm of the V ', the V that obtain ", G ', G ", by the controlled magnitude of voltage V of iteration; The control magnitude of voltage V that the PC main frame will obtain feeds back in the tested power amplifier, generates relevant characters parameter value G; The PC main frame judges whether the performance index parameter value G that generates is the desired value G0 of gain performance index parameter;
(4), then preserve this current control magnitude of voltage V ' if performance index parameter value G is within the desired value G0 of gain performance index parameter; If performance index parameter value G is not the desired value G0 of gain performance index parameter, then the PC main frame is reset to current control magnitude of voltage with the control magnitude of voltage V that iteration obtains, be about to V substitution V ', obtain the corresponding current performance index parameter value G ' of current control magnitude of voltage V ' again, and repeating step (3), up to performance index parameter value G is the desired value G0 of gain performance index parameter, and preserves the current control magnitude of voltage V of this moment;
(5) PC host computer control testing instrument unit is tested other every performance index of the power amplifier when this moment, the performance index parameter value was qualified automatically, verifies adaptive effect;
(6) after all testing performance index finished, system judged whether other power amplifiers tests of required test are finished automatically; If test does not finish, then system repeats steps (2) to (5) finishes up to all power amplifiers that need detect are all tested;
(7) if all power amplifiers that need test have all been tested and finished, then PC host computer control environmental experiment case heats up or the operation of lowering the temperature, and repeating step (2) finishes up to all temperature spots are all tested to (6);
(8) the PC main frame is preserved the testing journal sheet automatically after all temperature spot tests finish.
The formula of applied adaptive algorithm is in the described step (3):
Other performance index in the described step (5) comprise that gain index, fluctuation index, intermodulation decay index, ACLR index, automatic control level index, working current index, the output power of output signal read index and frequency error index.
Realize the radio-frequency power amplifier adaptive testing system of above-mentioned method of testing, comprise environmental experiment case, testing instrument unit, switch switching unit and PC main frame, described testing instrument unit links to each other with PC main frame and switch switching unit respectively, described PC main frame links to each other with switch switching unit and environmental experiment case respectively, also external power amplifier I and the power amplifier II that is placed in the environmental experiment case of described PC main frame and switch switching unit.
Described testing instrument unit comprises signal generator, spectrum analyzer, direct supply, power meter, isolator, coupling mechanism I, coupling mechanism II, attenuator, digital multimeter; Described signal generator links to each other with isolator, coupling mechanism I and switch switching unit successively, described spectrum analyzer links to each other with coupling mechanism II, attenuator and switch switching unit successively, described direct supply links to each other with digital multimeter and switch switching unit successively, described coupling mechanism I and coupling mechanism II also link to each other with power meter respectively, and described power meter, signal generator, spectrum analyzer and digital multimeter all also link to each other with described PC main frame.
Described switch switching unit comprises monitor board, power switching device I, power switching device II, radio-frequency (RF) switch I, radio-frequency (RF) switch II, load I and load II, described power switching device I, power switching device II, the control end of radio-frequency (RF) switch I and radio-frequency (RF) switch II links to each other with monitor board respectively, described load I links to each other with radio-frequency (RF) switch I, load II links to each other with radio-frequency (RF) switch II, described power switching device I and power switching device II all link to each other with described digital multimeter, described radio-frequency (RF) switch I links to each other with described attenuator, radio-frequency (RF) switch II links to each other described radio-frequency (RF) switch I with described coupling mechanism II, radio-frequency (RF) switch II, power switching device I and power switching device II also link to each other with power amplifier I and power amplifier II respectively.
Described PC main frame also is provided with configuration module, instrument control module, communication module and data processing module.
The present invention has following advantage and effect with respect to prior art:
(1) the present invention can be reduced to a key operation with the high and low temperature experiment of wasting time and energy originally, has greatly alleviated tester's labour intensity, has improved work efficiency;
(2) the present invention introduces adaptation function first in like product, has enriched means of testing, has widened the range of application of automatic test;
(3) standard of the present invention testing procedure, the test error of having avoided the improper operation of personnel to cause is convenient to quality management.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present invention.
Fig. 2 is a switch switching unit structural representation of the present invention.
Fig. 3 is a process flow diagram of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, this radio-frequency power amplifier adaptive testing system is made of testing instrument unit, switch switching unit, environmental experiment case and PC main frame.Testing instrument unit links to each other with PC main frame and switch switching unit respectively.The PC main frame links to each other with switch switching unit, is used for the blocked operation of gauge tap switch unit, and this PC main frame also links to each other with described environmental experiment case, and the temperature variation of the experimental box that is used to control environment is to simulate different high and low temperature environment.Described switch switching unit and PC main frame also all be placed on the environmental experiment case in power amplifier to be tested link to each other.
As shown in Figure 1, described testing instrument unit comprises signal generator, spectrum analyzer, direct supply, power meter, isolator, coupling mechanism I, coupling mechanism II, attenuator and digital multimeter.Described signal generator links to each other with isolator and coupling mechanism I successively, and described coupling mechanism I links to each other with switch switching unit; Described spectrum analyzer links to each other with coupling mechanism II and attenuator successively, and described this attenuator also links to each other with switch switching unit; Described direct supply links to each other with digital multimeter, and this digital multimeter also links to each other with switch switching unit.Two input ends of power meter link to each other with another output terminal of coupling mechanism I and coupling mechanism II respectively.Described power meter, signal generator, spectrum analysis and digital multimeter all link to each other with the PC main frame by the GPIB telecommunication cable.
Described PC main frame is provided with configuration module, instrument control module, communication module and data processing module.Wherein, configuration module is used to be provided with every test parameter of power amplifier, as calibration value of frequency of operation, signaling mode, rated power, number of carrier wave and test instrumentation etc., these test parameters just preestablish before test, and this test parameter is kept in local computer or the database; The instrument control module is used to send the instrument driving command, and Long-distance Control is respectively tested instrument and tested automatically; Communication module is used for carrying out various communication with tested power amplifier product, signal switch unit and environmental experiment case, comprises that each monitoring parameter and control voltage, the control signal switch unit that read and be provided with the power amplifier single-chip microcomputer switch between each tested power amplifier, remote control environmental experiment case carries out the heating-cooling operation; Data processing module is used for preserving, showing test results, and calls EXCEL control generation form after test finishes automatically.
As shown in Figure 2, switch switching unit is core of the present invention.This switch switching unit comprises that two resistances are 50 ohm load I and load II, also comprise rf input interface, radio frequency output interface, direct supply input interface, radio-frequency (RF) switch I, radio-frequency (RF) switch II, monitor board, power switching device I, power switching device II, input interface I, input interface II, output interface I, output interface II, direct supply output interface I and direct supply output interface II.
Described radio-frequency (RF) switch I links to each other with rf input interface, input interface I, input interface I and load I respectively, and described rf input interface links to each other with coupling mechanism I in the testing instrument unit, is used for the test signal of acceptance test instrument unit input; Described radio-frequency (RF) switch II links to each other with radio frequency output interface, output interface I, output interface II and load II respectively, and this radio-frequency (RF) switch II also links to each other with attenuator in the testing instrument unit.
The control end of radio-frequency (RF) switch I, radio-frequency (RF) switch II, power switching device I and power switching device II all links to each other with monitor board (not embodying among the figure), and this monitor board is used to control the switching of radio-frequency (RF) switch and the power on/off of power switching device.After interconnecting, two input ends of described two power switching devices link to each other with the direct supply input interface again, the output terminal of described power switching device I also links to each other with direct supply output interface I, the output terminal of power switching device II links to each other with direct supply output interface II, so that the direct current supply of operate as normal is provided to power amplifier.
When this switch switching unit and PC main frame external power amplifier PA I and PAII, described direct supply output interface I links to each other with the input end of power amplifier PA I, direct supply output interface II links to each other with the input interface of power amplifier PAII, the output terminal of described power amplifier PA I links to each other with output interface I, and the output terminal of power amplifier PAII links to each other with output interface II.The input end of this power amplifier PA I links to each other with input interface I, and the input end of power amplifier PAII links to each other with input interface II.Power amplifier PA I and power amplifier PA II also link to each other with the PC main frame respectively.
As shown in Figure 3, because the control voltage of the single-chip microcomputer output in the RF index of power amplifier and the power amplifier becomes the linear dependence of monotone increasing/subtract, so can regard as and satisfy formula f (V
k)=x
k, V in the formula
kExpression control voltage, x
kRepresent corresponding radio frequency value.So if will make x
kEqual desired value x
T arg et, the magnitude of voltage of single-chip microcomputer output can be obtained by cutting the string method fast, and its iterative formula is as follows:
Formula (1) is the adaptive algorithm formula that is adopted.
In conjunction with the flow process of Fig. 3, be example with the adaptive process of the gain performance of power amplifier, the flow process that the control voltage adaptive is adjusted is described.
When testing, the tester at first is written into test cases according to the model of tested power amplifier module, and set in advance the desired value G0 of the gain performance index parameter of this power amplifier, simultaneously with design temperature point sequence Temp, and the Current Temperatures of experiment environment box is set to Temp i; When the temperature monitoring program of software detects the experimental box Current Temperatures and reaches first probe temperature point, the self adaptive flow of beginning power amplifier gain performance index parameter; PC host computer control switch switching unit switches to first above the power amplifier that need test with change-over switch, and the synchronous signal generator generates radiofrequency signal, this radiofrequency signal is affacted above the power amplifier of this test; The PC main frame reads the control magnitude of voltage initial value V that sets in advance in the single-chip microcomputer ", and read the numerical value of the yield value G ", generally speaking, all the numerical value with G0 is made as G " of this moment; The PC main frame is inquired about current gain-controlled voltage value V ' from the single-chip microcomputer of tested power amplifier, and reads corresponding power amplifier yield value G ' by spectrum analyzer or power meter; In V ', G ', V ", G " substitution formula (1), can try to achieve by iteration and under Temp i, satisfy G " the control magnitude of voltage during=G0
All power amplifiers that need detect are tested according to above steps in sequence then.Wherein, the index of required detection comprises that also fluctuation index, intermodulation decay index, ACLR index and automatic control level index, working current index, the output power of output signal read index and frequency error index.After testing a temperature spot, the target temperature of PC main frame environmental experiment case is set to next probe temperature point, carries out the gain-adaptive flow process of next temperature spot, finishes up to all temperature spot self-adaptations.
As mentioned above, just can realize the present invention preferably.
Claims (7)
1. the method for testing of a radio-frequency power amplifier adaptive testing system is characterized in that may further comprise the steps:
(1) in advance the environment temperature of power amplifier work is made as predetermined value, sets the desired value G0 of the gain performance index parameter of power amplifier output signal simultaneously, and start test macro;
(2) PC host computer control switch switching unit switches to change-over switch on first tested power amplifier, reads the control voltage initial value V " and relevant characters initial parameter value G " that stores in this power amplifier simultaneously; The PC main frame is controlled testing instrument unit again and is generated radiofrequency signal, and the PC main frame reads current control magnitude of voltage V ' and the corresponding current performance index parameter value G ' in tested power amplifier this moment simultaneously;
(3) system is with the numerical value substitution adaptive algorithm of the V ', the V that obtain ", G ', G ", by the controlled magnitude of voltage V of iteration; The control magnitude of voltage V that the PC main frame will obtain feeds back in the tested power amplifier, generates relevant characters parameter value G; The PC main frame judges whether the performance index parameter value G that generates is the desired value G0 of gain performance index parameter;
(4), then preserve this current control magnitude of voltage V ' if performance index parameter value G is the desired value G0 of gain performance index parameter; If performance index parameter value G is not the desired value G0 of gain performance index parameter, then the PC main frame is reset to current control magnitude of voltage with the control magnitude of voltage V that iteration obtains, be about to V substitution V ', obtain the corresponding current performance index parameter value G ' of current control magnitude of voltage V ' again, and repeating step (3), up to performance index parameter value G is the desired value G0 of gain performance index parameter, and preserves the current control magnitude of voltage V of this moment;
(5) PC host computer control testing instrument unit is tested other every performance index of the power amplifier when this moment, the performance index parameter value was qualified automatically, verifies adaptive effect;
(6) after all testing performance index finished, system judged whether other power amplifiers tests of required test are finished automatically; If test does not finish, then system repeats steps (2) to (5) finishes up to all power amplifiers that need detect are all tested;
(7) if all power amplifiers that need test have all been tested and finished, then PC host computer control environmental experiment case heats up or the operation of lowering the temperature, and repeating step (2) finishes up to all temperature spots are all tested to (6);
(8) the PC main frame is preserved the testing journal sheet automatically after all temperature spot tests finish.
2. the method for testing of radio-frequency power amplifier adaptive testing according to claim 1 system is characterized in that applied adaptive algorithm formula is in the described step (3):
3. the method for testing of radio-frequency power amplifier adaptive testing according to claim 1 system, it is characterized in that other performance index in the described step (5) comprise that gain index, fluctuation index, intermodulation decay index, ACLR index, automatic control level index, working current index, the output power of output signal read index and frequency error index.
4. realize the radio-frequency power amplifier adaptive testing system of each described method of testing of claim 1～3, comprise the environmental experiment case, it is characterized in that, also comprise testing instrument unit, switch switching unit and PC main frame, described testing instrument unit links to each other with PC main frame and switch switching unit respectively, described PC main frame links to each other with switch switching unit and environmental experiment case respectively, also external power amplifier I and the power amplifier II that is placed in the environmental experiment case of described PC main frame and switch switching unit.
5. radio-frequency power amplifier adaptive testing according to claim 4 system, it is characterized in that described testing instrument unit comprises signal generator, spectrum analyzer, direct supply, power meter, isolator, coupling mechanism I, coupling mechanism II, attenuator, digital multimeter; Described signal generator links to each other with isolator, coupling mechanism I and switch switching unit successively, described spectrum analyzer links to each other with coupling mechanism II, attenuator and switch switching unit successively, described direct supply links to each other with digital multimeter and switch switching unit successively, described coupling mechanism I and coupling mechanism II also link to each other with power meter respectively, and described power meter, signal generator, spectrum analyzer and digital multimeter all also link to each other with described PC main frame.
6. radio-frequency power amplifier adaptive testing according to claim 5 system, it is characterized in that, described switch switching unit comprises monitor board, power switching device I, power switching device II, radio-frequency (RF) switch I, radio-frequency (RF) switch II, load I and load II, described power switching device I, power switching device II, the control end of radio-frequency (RF) switch I and radio-frequency (RF) switch II links to each other with monitor board respectively, described load I links to each other with radio-frequency (RF) switch I, load II links to each other with radio-frequency (RF) switch II, described power switching device I and power switching device II all link to each other with described digital multimeter, described radio-frequency (RF) switch I links to each other with described attenuator, radio-frequency (RF) switch II links to each other described radio-frequency (RF) switch I with described coupling mechanism II, radio-frequency (RF) switch II, power switching device I and power switching device II also link to each other with power amplifier I and power amplifier II respectively.
7. radio-frequency power amplifier adaptive testing according to claim 4 system is characterized in that described PC main frame also is provided with configuration module, instrument control module, communication module and data processing module.
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