CN100473996C - Apparatus for detecting linear index of power amplifier - Google Patents
Apparatus for detecting linear index of power amplifier Download PDFInfo
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Abstract
The present invention discloses a detection equipment of linear index of power amplifier. Said detection equipment includes power detection circuit and microprocessor. The described power detection circuit is used for receiving output signal of power amplifier to be detected, converting power of main channel signal into first digital signal, converting the power of adjacent channel signal obtained by filtration into second digital signal and inputting the first digital signal and second digital signal into the microprocessor; the described microprocessor can utilize the first digital signal, second digital signal and correspondent relationship of preset digital signal and power to obtain the main channel signal power and adjacent channel signal power and calculate the linear index value of power amplifier. Said invention also provides a method for detecting linear index of power amplifier.
Description
Technical field
The present invention relates to power amplifier field, particularly a kind of pick-up unit of linear index of power amplifier.
Background technology
In recent years,, the linearity of communication system intermediate power amplifier is required also to have improved greatly, therefore to the also corresponding raising of requirement of power amplifier linearity debugging along with the develop rapidly of communication system.
Debug system of the prior art as shown in Figure 1, this system comprises and waits to transfer power scale amplifier, radio-frequency signal source, direct supply, galvanometer, attenuator and frequency spectrograph, wherein waits to transfer to comprise power tube, control circuit, adjustable biasing circuit, input matching circuit and output matching circuit in the power scale amplifier.Radio-frequency signal source produces radiofrequency signal as the input signal of waiting to transfer the power scale amplifier, direct supply transfers the power scale amplifier that direct current is provided for waiting, galvanometer is used to monitor the working current of waiting to transfer the power scale amplifier, attenuator is decayed to guarantee being input to the signal power of frequency spectrograph in the permission measurement range of frequency spectrograph to the output signal of power amplifier, frequency spectrograph is used to measure the spectral characteristic of power amplifier output signal, and for example power, adjacent-channel power leak than (ACLR) value etc.Wait to transfer control circuit in the power scale amplifier to be used on off operating mode according to input control signal control biasing circuit, thereby the duty of control power amplifiers is for opening or turn-offing, and this control circuit generally adopts Erasable Programmable Logic Device (EPLD).
Adopt debug system shown in Figure 1, at first under the condition of closing radio-frequency signal source output, adjust power amplifier bias voltage, guarantee that quiescent current is the recommendation of power amplifier element handbook to specialized range.Open radio-frequency signal source then, to power amplifier input radio frequency signal, make the output signal of power amplifier reach the power of appointment, the bias voltage of adjusting power amplifier makes the output linearity of power amplifier reach optimum.Can make the gain of power amplifier change owing to change bias voltage, need repeatedly repeat to adjust the bias voltage of power input and power amplifier, could make the output power of power amplifier and linearity reach requirement.
In existing debug process, will wait to transfer power scale amplifier amplifying signal usually, after the attenuator decay, the input spectrum instrument is by the output power and the linear index of frequency spectrograph measurement power amplifier, described linear index such as ACLR or third order intermodulation (IM3).Described ACLR is meant the ratio of neighboring trace leakage power and main channel carrier power in the output signal after power amplifier amplifies, and IM3 is meant the ratio of third order intermodulation power and available signal power.
As shown in Figure 2, power measured by frequency spectrograph and linear circuit comprises attenuator, low-converter, local frequency compositor, modulus (A/D) converter, microprocessor, and wherein microprocessor comprises fast Fourier transform (FFT) module and integration module.Behind the output signal input spectrum instrument of power amplifier, at first pass through the decay of attenuator; By after the local oscillation signal mixing of low-converter according to signal after decaying and the output of local frequency compositor, be digital signal with analog signal conversion then by A/D converter; Carry out Fourier transform by the FFT module then, obtain frequency spectrum; Carry out the power integration by integration module and obtain the power of main channel signal and the power of neighboring trace signal, again according to the power of main channel signal and the power calculation ACLR of neighboring trace signal.
Because frequency spectrograph adopts the method for integral and calculating to draw the performance number of the each several part of surveying, so frequency spectrum is whenever finished once the long time of measurement needs to the power and the linear index of power amplifier output signal.And, owing to the accent of a power amplifier surveyed repeatedly to adjust bias voltage and repeatedly to the measurement of output linear index, therefore utilize frequency spectrograph on average to need dozens of minutes just can finish the further like this speed that can reduce extensive accent power scale amplifier greatly surveyed in the accent of a power amplifier.
Summary of the invention
In view of this, the invention provides the pick-up unit of two kinds of linear index of power amplifier, its purpose is to improve the speed of detection power linearity of amplifier index, to improve the speed of transferring the power scale amplifier.
For reaching above-mentioned first purpose, the present invention proposes following technical scheme:
A kind of pick-up unit of linear index of power amplifier comprises coupling mechanism, first power detector, first A/D converter, local frequency compositor, low-converter, midband wave filter, second power detector, second A/D converter and microprocessor; Wherein,
Described coupling mechanism, be used for the output signal of power amplifier is coupled into the neighboring trace signal that is used to detect the main channel signal of main channel carrier power and is used to detect the side channel leakage power, the main channel signal is imported first power detector, neighboring trace signal input low-converter;
Described first power detector, the signal power that is used for coupling mechanism is coupled to described first power detector is converted into first aanalogvoltage, and first aanalogvoltage is imported first A/D converter;
Described first A/D converter is used for the aanalogvoltage from described first power detector is converted to first digital signal and input microprocessor;
Described local frequency compositor is subjected to the local oscillation signal of the frequency control down converter output corresponding frequencies of described microprocessor, and wherein, the local oscillation signal frequency f loup when measuring upper side band power is floup=fc-fs+df or floup=fc+fs-df; Local oscillation signal frequency f lodown when measuring lower sideband power is flodown=fc-fs-df or flodown=fc+fs+df; Wherein, fc is the main channel frequency, and df is the skew of upper side band frequency or lower sideband frequency and main channel frequency, and fs is the centre frequency of if bandpas filter response;
Described low-converter, be used for being coupled to the signal of described low-converter according to upper side band local oscillation signal or lower sideband local oscillation signal, coupling mechanism, frequency conversion obtains upper side band intermediate-freuqncy signal or lower sideband intermediate-freuqncy signal, and upper side band intermediate-freuqncy signal or lower sideband intermediate-freuqncy signal are sent to if bandpas filter;
Described if bandpas filter after being used for upper side band intermediate-freuqncy signal or lower sideband intermediate-freuqncy signal carried out filtering, is sent to second power detector;
Described second power detector is used for the intermediate-freuqncy signal power from described if bandpas filter is converted into second aanalogvoltage, and second aanalogvoltage is imported second A/D converter;
Described second A/D converter is used for second aanalogvoltage from described second power detector is converted to second digital signal and input microprocessor;
Described microprocessor is used for the corresponding relation according to first digital signal, second digital signal and digital signal that sets in advance and power, obtains the power of main channel signal and the power of neighboring trace signal, and the linear index value of rated output amplifier.
In the such scheme, described pick-up unit also comprises first attenuator, is used for the working range of the main channel signal attenuation after the coupling mechanism coupling to described first power detector.
In the such scheme, described pick-up unit also comprises second attenuator, is used for neighboring trace signal attenuation after coupling mechanism coupling to the working range of low-converter.
In the such scheme, described pick-up unit also comprises intermediate frequency amplifier, be used to compensate the neighboring trace signal that amplifies described if bandpas filter output, and the neighboring trace signal that will compensate after amplifying is imported described second power detector.
In the such scheme, described pick-up unit comprises second if bandpas filter, is used for the further filtering of neighboring trace signal to described intermediate frequency amplifier output, and the neighboring trace signal that further filtering obtains is imported described second power detector.
In the such scheme, described pick-up unit also comprises second intermediate frequency amplifier, is used to compensate the neighboring trace signal that amplifies described second if bandpas filter output, and the neighboring trace signal after the described compensation amplification is imported second power detector.
In the such scheme, described pick-up unit also comprises attenuator, be used for attenuated output signal with power amplifier after, be sent to described coupling mechanism.
For reaching above-mentioned second purpose, the present invention includes following technical scheme:
A kind of pick-up unit of linear index of power amplifier comprises local frequency compositor, low-converter, if bandpas filter, controllable attenuator, second power detector, second A/D converter and microprocessor; Wherein,
Described local frequency compositor, be subjected to the frequency control down converter timesharing of described microprocessor to export first local oscillation signal and second local oscillation signal, wherein, the first local oscillation signal frequency f lo is flo=fc-fs or flo=fc+fs, and the second local oscillation signal frequency f loup is floup=fc-fs+df or floup=fc+fs-df when measuring upper side band power; The second local oscillation signal frequency f lodown is flodown=fc-fs-df or flodown=fc+fs+df when measuring lower sideband power; Wherein, fc is the main channel frequency, and df is the skew of upper side band frequency or lower sideband frequency and main channel frequency, and fs is the centre frequency of if bandpas filter response;
Described low-converter, be used for obtaining first intermediate-freuqncy signal and importing if bandpas filter, obtain second intermediate-freuqncy signal and import if bandpas filter according to the output signal down coversion of described second local oscillation signal and power amplifier according to the output signal down coversion of described first local oscillation signal and power amplifier;
Described if bandpas filter is used for that described first intermediate-freuqncy signal is carried out filtering and obtains the main channel signal and import controllable attenuator, described second intermediate-freuqncy signal is carried out filtering obtain the neighboring trace signal and import controllable attenuator;
Described controllable attenuator is used for the main channel signal of if bandpas filter output is carried out importing second power detector after the high attenuation, and the neighboring trace signal that if bandpas filter is exported carries out little decay or unattenuated back input second power detector;
Described second power detector, be used for the main channel signal power of controllable attenuator output is converted into first aanalogvoltage and imports second A/D converter, and the neighboring trace signal power of controllable attenuator output is converted into second aanalogvoltage and imports second A/D converter;
Described second A/D converter is used for described first aanalogvoltage is converted to first digital signal and input microprocessor, and second aanalogvoltage is converted to second digital signal and input microprocessor;
Described microprocessor is used for the corresponding relation according to first digital signal, second digital signal and digital signal that sets in advance and power, obtains the power of main channel signal and the power of neighboring trace signal, and the linear index value of rated output amplifier.
In the such scheme, described pick-up unit further comprises intermediate frequency amplifier, is used to compensate the intermediate-freuqncy signal of amplifying described midband wave filter output, and will compensate amplified IF signal and import described controllable attenuator.
In the such scheme, described pick-up unit further comprises second if bandpas filter, is used for further the intermediate-freuqncy signal of described controllable attenuator output being carried out filtering, and further filtered intermediate-freuqncy signal is imported described second power detector.
In the such scheme, described pick-up unit further comprises second intermediate frequency amplifier, is used to compensate the intermediate-freuqncy signal of amplifying described second if bandpas filter output, and will compensate amplified IF signal and be sent to described second power detector.
In the such scheme, described pick-up unit further comprises attenuator, be used for attenuated output signal with power amplifier after, be sent to described low-converter.
From such scheme as can be seen, the present invention utilizes specific simple mechanism, directly the power transfer with the power amplifier output signal each several part is a voltage, obtain corresponding performance number according to voltage, power and linear index that can the fast measuring power amplifier output signal, improve the speed of detection power linearity of amplifier index, thereby improved the speed of transferring the power scale amplifier.Further, the invention provides the device of the power of the power of measuring the main channel signal simultaneously and neighboring trace signal, satisfied the needs of different application environment.Because the device that the present invention adopts is simple, cheap, greatly reduce the cost of transferring the power scale amplifier, be suitable for extensive use.Simultaneously, device provided by the invention also can be integrated in the base station equipment, and linear index of power amplifier is carried out detection of dynamic and control.
Description of drawings
Fig. 1 is the structural representation of debug system in the prior art;
Fig. 2 is the circuit diagram of measured signal power and linear index in the frequency spectrograph;
Fig. 3 is the pick-up unit synoptic diagram of first embodiment of the invention neutral line index;
Fig. 4 is the spectrum diagram of if bandpas filter when measuring upper side band power;
Fig. 5 is the spectrum diagram of if bandpas filter when measuring lower sideband power;
Fig. 6 be when measuring upper side band power each frequency concern synoptic diagram;
Fig. 7 be when measuring lower sideband power each frequency concern synoptic diagram;
Fig. 8 is the pick-up unit synoptic diagram that increases the one-level if bandpas filter in Fig. 3;
Fig. 9 is the pick-up unit synoptic diagram of second embodiment of the invention neutral line index.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in more detail by the following examples.
Different with the integral of existing frequency spectrograph, the present invention adopts power detector that the power of radiofrequency signal is converted into aanalogvoltage, obtains corresponding performance number according to this aanalogvoltage then, again according to the output linearity of performance number rated output amplifier.
As shown in Figure 3, pick-up unit that first embodiment of the invention adopts comprises: attenuator 201, coupling mechanism 202, first attenuator 210, first power detector 211, first A/D converter 212, second attenuator 203, low-converter 204, local frequency compositor 205, if bandpas filter 206, intermediate frequency amplifier 207, second power detector 208, second A/D converter 209 and microprocessor 213.Wherein first power detector 211 and second power detector 208 can be that same type wave detector also can be dissimilar wave detector, and first A/D converter 212 and second A/D converter 209 can be that same type A/D converter also can be dissimilar A/D converter.First power-sensing circuit that first attenuator 210, first power detector 211 and first A/D converter 212 are formed is used to detect the power of main channel signal; Second power-sensing circuit that second attenuator 203, low-converter 204, local frequency compositor 205, if bandpas filter 206, intermediate frequency amplifier 207, second power detector 208 and second A/D converter 209 are formed is used to detect the power of neighboring trace signal.
The effect of each module is as follows among Fig. 3: attenuator 201 with the signal attenuation of power amplifier to be detected output after input coupler 202; Coupling mechanism 202 is with the signal separated into two parts, and a part is imported first power-sensing circuit, is used to measure the power of main channel signal, and another part is imported second power-sensing circuit, is used to measure the power of neighboring trace signal; First attenuator 210 will be from the signal attenuation of coupling mechanism 202 input in the linear detection range of first power detector 211, with the precision that guarantees to measure; First power detector 211 is root mean square (RMS) value power detector, is used for the power of radiofrequency signal is converted into aanalogvoltage; First A/D converter 212 is converted to digital signal with this aanalogvoltage and sends into microprocessor 213; Second attenuator 203 will be imported signal low-converter 204 then from the signal attenuation of coupling mechanism 202 input in the range of linearity of low-converter 204; Local frequency compositor output frequency under the frequency control of microprocessor is that the local oscillation signal of flo is given low-converter 204; Low-converter 204 obtains the intermediate-freuqncy signal that centre frequency is fi according to the radiofrequency signal and the local oscillation signal of input after the mixing, and when flo is higher than radiofrequency signal centre frequency fc, fi=fc-flo, when flo is lower than fc, fi=flo-fc; 206 pairs of described intermediate-freuqncy signals of if bandpas filter are carried out filtering, obtain the intermediate-freuqncy signal of required frequency range; Because the loss ratio that if bandpas filter produces is bigger, therefore use intermediate frequency amplifier 207 that signal compensation is amplified back input second power detector 208; Second power detector 208 is converted into aanalogvoltage with the power of filtered intermediate-freuqncy signal; Second A/D converter 209 is converted to digital signal with described aanalogvoltage and sends into microprocessor 213; Microprocessor 213 can be single-chip microcomputer, also can be digital signal processing chip (DSP), it with A/D converter, local frequency compositor between be connected by ordinary numbers signal input tube pin, and calculate the power P o of main channel and the power of neighboring trace respectively according to the digital signal of first A/D converter 212 and the input of second A/D converter 209.
When input signal is the signal that sends in particular time-slot, the signal of time division duplex (TDD) communication system for example, the present invention can be by the digital signal input pin to microprocessor 213 input external sync trigger pips, work in the time slot inter-sync that sends signal by microprocessor 213 control first A/D converters 212 and second A/D converter 209, to guarantee result's accuracy.Further, microprocessor 213 directly can also be connected with the control circuit of pertinent instruments such as radio-frequency signal generator and power amplifier, directly control the switch working state of pertinent instruments and power amplifier, the power of synchro measure power amplifier output signal and linear index according to the external sync trigger pip.
In addition, microprocessor can further be connected with computing machine by interface, this interface can adopt parallel port, serial ports or USB (universal serial bus) (USB) interface etc. and compunication, power P o with the main channel signal, ACLR and other related data send computing machine to, are convenient to do other relevant control and show, write down related data.
Use the measuring process of device shown in Figure 2 as follows:
Before measurement, at first pick-up unit is calibrated, obtain the detailed corresponding relation between the detecting circuit of the power of real input signal and power detector, for example both corresponding tables or funtcional relationship, with the accuracy that guarantees to measure, described detecting circuit is represented with the corresponding digital signal that is input to microprocessor.And after calibration, described corresponding relation is kept in the microprocessor 213.
In measuring process, when the output signal of power amplifier to be measured is imported this device, the power of microprocessor 213 control survey main channel signals and the power of neighboring trace signal, and calculate adjacent-channel power leakage ratio.
Because main channel has two neighboring traces, promptly upper side band and lower sideband need to control local frequency and make the signal of low-converter timesharing output suitable frequency measure upper side band power and lower sideband power respectively in measuring process.If the main channel frequency of input signal is fc, the local frequency of local frequency compositor 205 outputs is flo, and the signal main channel frequency that obtains after low-converter 204 down coversions becomes fi, when flo is less than fc, fi=fc-flo, when flo is greater than fc, fi=flo-fc.Because the skew of upper side band, lower sideband and main channel frequency is df, and is known quantity, the centre frequency of establishing the if bandpas filter response is fs, and fs=fi+df is then arranged when measuring upper side band power, and fs=fi-df is arranged when measuring lower sideband power.Fig. 4 and Fig. 5 have provided the spectrum diagram of if bandpas filter when measuring upper side band power and lower sideband power respectively.
When measuring upper side band power, the local frequency flo of microprocessor 213 control local frequency compositor outputs is floup, here get floup less than fc, and the value of described floup can be determined by the relational expression fi=fc-floup at low-converter place and the relational expression fi=fs-df at if bandpas filter place: floup=fc-fi=fc-(fs-df)=fc-fs+df.Relation between above-mentioned each frequency as shown in Figure 6.Can certainly get floup greater than fc, determine floup=fc+fi=fc+fs-df according to fi=floup-fc and fi=fs-df so.
When measuring lower sideband power, the local frequency flo of microprocessor 213 control local frequency compositor outputs is flodown, here get flodown less than fc, and the value of described flodown can be determined by the relational expression fi=fc-flodown at low-converter place and the relational expression fi=fs+df at if bandpas filter place: flodown=fc-fi=lc-(fs+df)=fc-fs-df.Relation between above-mentioned each frequency as shown in Figure 7.Can certainly get flodown greater than fc, determine flodown=fc+fi=fc+fs+df according to fi=flodown-fc and fi=fs+df so.
Can only measure the power P up of upper side band and the power P o1 of main channel signal, calculate Pup/Po1, also can only measure the power P down of lower sideband and the power P o2 of main channel signal, calculate Puo/Po2 as the ACLR value as the ACLR value.Further, can successively measure after Pup, Po1 and Pdown, the Po2, with power bigger in the middle of Pup and the Pdown as the neighboring trace signal, the power of promptly getting the neighboring trace signal equals max (Pup, Pdown), with the mean value of Po1 and the Po2 power as the main channel signal, the power of promptly getting the main channel signal equals (Po1+Po2)/2, calculate then ACLR equal max (Pup, Pdown)/((Po1+Po2)/2).
In device shown in Figure 3, when measuring the power of neighboring trace signal, need leak ratio greater than adjacent-channel power to the rejection ratio that departs from constant-frequency signal, generally need more than the big 10dB.If the single-stage if bandpas filter can not reach the rejection ratio of expection, can in circuit, adopt the mode of multi-stage cascade, the circuit of employing two-stage cascade mode as shown in Figure 8, Fig. 8 on the basis of Fig. 3, increased by second if bandpas filter 214 and and intermediate frequency amplifier 215, formed the mode of two-stage cascade, to reach the signal suppressing ratio of expection.Use the measuring method of this device identical, repeat no more here with the measuring method of using device shown in Figure 3.
In first embodiment, adopt two circuit to measure the power of main channel signal and the power of neighboring trace signal simultaneously respectively, in a second embodiment, utilize same circuit timesharing to measure the power of main channel signal and the power of neighboring trace signal.
The device of second embodiment of the invention as shown in Figure 9, this device comprises: attenuator 201, local frequency compositor 205, low-converter 204, if bandpas filter 206, intermediate frequency amplifier 207, controllable attenuator 218, the 3rd intermediate frequency amplifier 217, second if bandpas filter 214, second intermediate frequency amplifier 215, second power detector 208, second A/D converter 209, microprocessor 213.Circuit diagram shown in Figure 9 is compared with circuit diagram shown in Figure 3, lack coupling mechanism 202, second attenuator 203, first attenuator 210, first power detector 211 and first A/D converter 212, promptly saved the branch road of the power of special measurement main channel signal; Controllable attenuator 218 and the 3rd intermediate frequency amplifier 217 have been Duoed than circuit diagram shown in Figure 3.Wherein controllable attenuator 218 is controlled its power attenuation value according to the high-low level of control pin, and the high-low level various combination of a plurality of control pins forms the pad value of different capacity, microprocessor 213 is by expanded circuit control controllable attenuator, when measuring the power of main channel signal, carry out high attenuation, when measuring the power of neighboring trace signal, carry out little decay or unattenuated; The effect of the 3rd intermediate frequency amplifier 217 mainly is the high attenuation of compensation controllable attenuator 218.
In a second embodiment, when measuring the power of neighboring trace signal, the same among the local frequency of microprocessor control local frequency compositor output and first embodiment, and in the process of the power of measuring the neighboring trace signal, microprocessor control controllable attenuator is carried out little decay or unattenuated to signal, measures the performance number of neighboring trace signal.
When measuring the power of main channel signal,,, determine flo=fc-fi=fc-fs this moment so by the relational expression fi=fc-flo at low-converter place and the relational expression fi=fs at if bandpas filter place if get flo less than fc; If get flo,, determine flo=fc+fi=fc+fs this moment so by fi=flo-fc and fi=fs greater than fc.Microprocessor control local frequency compositor output local frequency is the signal of above-mentioned flo, and controls controllable attenuator and carry out high attenuation, just can measure the performance number of main channel.
Microprocessor uses the method described in first embodiment according to the performance number of the above-mentioned neighboring trace signal that measures and the performance number of main channel signal, just can calculate the ACLR value.
In addition, the device among the first embodiment of the invention and second embodiment not only can be used for measuring the Power leakage ratio of neighboring trace signal, can also be used to measuring waiting other linear index such as third order intermodulation (IM3).When measuring IM3, measurement be the power of main channel signal and the power of intermodulation part, be analogous to the power of the main channel signal when measuring ACLR and the power of neighboring trace signal, measuring method is identical.Different is, because during the IM3 test, useful signal is two continuous waves of 1MHz of being separated by, and therefore the bandwidth of the wave filter that is adopted in the device need be less than 1MHz.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1, a kind of pick-up unit of linear index of power amplifier, it is characterized in that described pick-up unit comprises coupling mechanism, first power detector, first A/D converter, local frequency compositor, low-converter, if bandpas filter, second power detector, second A/D converter and microprocessor; Wherein,
Described coupling mechanism is coupled into the neighboring trace signal that is used to detect the main channel signal of main channel carrier power and is used to detect the side channel leakage power with the output signal of power amplifier, and the main channel signal is imported first power detector, neighboring trace signal input low-converter;
Described first power detector, the signal power that is used for coupling mechanism is coupled to described first power detector is converted into first aanalogvoltage, and first aanalogvoltage is imported first A/D converter;
Described first A/D converter is used for the aanalogvoltage from described first power detector is converted to first digital signal, and input microprocessor;
Described local frequency compositor is subjected to the local oscillation signal of the frequency control down converter output corresponding frequencies of described microprocessor, and wherein, the local oscillation signal frequency f loup when measuring upper side band power is floup=fc-fs+df or floup=fc+fs-df; Local oscillation signal frequency f lodown when measuring lower sideband power is flodown=fc-fs-df or flodown=fc+fs+df; Wherein, fc is the main channel frequency, and df is the skew of upper side band frequency or lower sideband frequency and main channel frequency, and fs is the centre frequency of if bandpas filter response;
Described low-converter, be used for being coupled to the signal of described low-converter according to upper side band local oscillation signal or lower sideband local oscillation signal, coupling mechanism, frequency conversion obtains upper side band intermediate-freuqncy signal or lower sideband intermediate-freuqncy signal, and upper side band intermediate-freuqncy signal or lower sideband intermediate-freuqncy signal are sent to if bandpas filter;
Described if bandpas filter after being used for upper side band intermediate-freuqncy signal or lower sideband intermediate-freuqncy signal carried out filtering, is sent to second power detector;
Described second power detector is used for the intermediate-freuqncy signal power from described if bandpas filter is converted into second aanalogvoltage, and second aanalogvoltage is imported second A/D converter;
Described second A/D converter is used for second aanalogvoltage from described second power detector is converted to second digital signal and input microprocessor;
Described microprocessor is used for the corresponding relation according to first digital signal, second digital signal and digital signal that sets in advance and power, obtains the power of main channel signal and the power of neighboring trace signal, and the linear index value of rated output amplifier.
2, pick-up unit according to claim 1 is characterized in that, described pick-up unit also comprises first attenuator, is used for the working range of the main channel signal attenuation after the coupling mechanism coupling to described first power detector.
3, pick-up unit according to claim 1 and 2 is characterized in that, described pick-up unit also comprises second attenuator, is used for the working range of the neighboring trace signal attenuation after the coupling mechanism coupling to low-converter.
4, pick-up unit according to claim 3, it is characterized in that, described pick-up unit also comprises intermediate frequency amplifier, be used to compensate the neighboring trace signal that amplifies described if bandpas filter output, and the neighboring trace signal that will compensate after amplifying is imported described second power detector.
5, pick-up unit according to claim 4, it is characterized in that, described pick-up unit comprises second if bandpas filter, is used for the further filtering of neighboring trace signal to described intermediate frequency amplifier output, and the neighboring trace signal that further filtering obtains is imported described second power detector.
6, pick-up unit according to claim 5, it is characterized in that, described pick-up unit also comprises second intermediate frequency amplifier, is used to compensate the neighboring trace signal that amplifies described second if bandpas filter output, and the neighboring trace signal after the described compensation amplification is imported second power detector.
7, pick-up unit according to claim 1 is characterized in that, described pick-up unit also comprises attenuator, be used for attenuated output signal with power amplifier after, be sent to described coupling mechanism.
8, a kind of pick-up unit of linear index of power amplifier, it is characterized in that described pick-up unit comprises local frequency compositor, low-converter, if bandpas filter, controllable attenuator, second power detector, second A/D converter and microprocessor; Wherein,
Described local frequency compositor, be subjected to the frequency control down converter timesharing of described microprocessor to export first local oscillation signal and second local oscillation signal, wherein, the first local oscillation signal frequency f lo is flo=fc-fs or flo=fc+fs, and the second local oscillation signal frequency f loup is floup=fc-fs+df or floup=fc+fs-df when measuring upper side band power; The second local oscillation signal frequency f lodown is flodown=fc-fs-df or flodown=fc+fs+df when measuring lower sideband power; Wherein, fc is the main channel frequency, and df is the skew of upper side band frequency or lower sideband frequency and main channel frequency, and fs is the centre frequency of if bandpas filter response;
Described low-converter, be used for obtaining first intermediate-freuqncy signal and importing if bandpas filter, obtain second intermediate-freuqncy signal and import if bandpas filter according to the output signal down coversion of described second local oscillation signal and power amplifier according to the output signal down coversion of described first local oscillation signal and power amplifier;
Described if bandpas filter is used for that described first intermediate-freuqncy signal is carried out filtering and obtains the main channel signal and import controllable attenuator, described second intermediate-freuqncy signal is carried out filtering obtain the neighboring trace signal and import controllable attenuator;
Described controllable attenuator is used for the main channel signal of if bandpas filter output is carried out importing second power detector after the high attenuation, and the neighboring trace signal that if bandpas filter is exported carries out little decay or unattenuated back input second power detector;
Described second power detector, be used for the main channel signal power of controllable attenuator output is converted into first aanalogvoltage and imports second A/D converter, and the neighboring trace signal power of controllable attenuator output is converted into second aanalogvoltage and imports second A/D converter;
Described second A/D converter is used for described first aanalogvoltage is converted to first digital signal and input microprocessor, and second aanalogvoltage is converted to second digital signal and input microprocessor;
Described microprocessor is used for the corresponding relation according to first digital signal, second digital signal and digital signal that sets in advance and power, obtains the power of main channel signal and the power of neighboring trace signal, and the linear index value of rated output amplifier.
9, pick-up unit according to claim 8, it is characterized in that, described pick-up unit further comprises intermediate frequency amplifier, is used to compensate the intermediate-freuqncy signal of amplifying described if bandpas filter output, and will compensate amplified IF signal and import described controllable attenuator.
10, pick-up unit according to claim 9, it is characterized in that, described pick-up unit further comprises second if bandpas filter, be used for further the intermediate-freuqncy signal of described controllable attenuator output being carried out filtering, and further filtered intermediate-freuqncy signal is imported described second power detector.
11, pick-up unit according to claim 10, it is characterized in that, described pick-up unit further comprises second intermediate frequency amplifier, be used to compensate the intermediate-freuqncy signal of amplifying described second if bandpas filter output, and will compensate amplified IF signal and be sent to described second power detector.
12, pick-up unit according to claim 8 is characterized in that, described pick-up unit further comprises attenuator, be used for attenuated output signal with power amplifier after, be sent to described low-converter.
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| CNB200510069293XA CN100473996C (en) | 2005-05-13 | 2005-05-13 | Apparatus for detecting linear index of power amplifier |
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| CNB200510069293XA CN100473996C (en) | 2005-05-13 | 2005-05-13 | Apparatus for detecting linear index of power amplifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101377531B (en) * | 2007-08-29 | 2011-09-14 | 海华科技股份有限公司 | Output power detecting structure with direction coupler and direction coupler |
| CN101893682B (en) * | 2010-06-25 | 2012-12-05 | 珠海和佳医疗设备股份有限公司 | Method for testing resonant power amplifying circuit |
| CN102386852B (en) * | 2011-07-19 | 2015-04-29 | 成都芯通科技股份有限公司 | Method for amplifying digital multi-carrier power and power amplifier for realizing same |
| CN103744010B (en) * | 2013-12-26 | 2017-01-18 | 中国电子科技集团公司第三十六研究所 | An automatic testing system and an automatic testing method of a continuous wave radio frequency power amplifier |
| CN104316760B (en) * | 2014-10-10 | 2017-07-11 | 中国电子科技集团公司第四十一研究所 | A kind of dominant frequency signal determinating circuit and decision method for being applied to microwave frequency counter |
| CN104579450A (en) * | 2014-12-05 | 2015-04-29 | 泉州市琪祥电子科技有限公司 | Small-sized indoor repeater with functions of automatically detecting linear state of amplifier and carrying out intelligent processing |
| CN106411435B (en) * | 2016-09-29 | 2019-06-11 | 宇龙计算机通信科技(深圳)有限公司 | A kind of RF transmitter and method of adjust automatically ACLR |
| CN108267650A (en) * | 2016-12-30 | 2018-07-10 | 上海优立检测技术股份有限公司 | A kind of radiated immunity test method of high accuracy |
| CN114553335A (en) * | 2020-11-25 | 2022-05-27 | 上海畅恒自动化设备有限公司 | Fast full-channel power detection circuit structure for self-adaptive channel selection |
| CN114629457A (en) * | 2021-12-30 | 2022-06-14 | 北京无线电计量测试研究所 | Device and method for controlling frequency source and frequency source |
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Effective date of registration: 20151021 Address after: 100083 Haidian District, Xueyuan Road, No. 29, Patentee after: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd. Patentee after: SHANGHAI DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd. Address before: 100083 Haidian District, Xueyuan Road, No. 29, Patentee before: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd. |
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