CN1390022A - Linear power amplifying method and device - Google Patents
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Abstract
The invention relates to the linear power amplifier and device combining the predistortion power amplifier with the feed forward power amplifier. The characters of the device are as follows. The predistortion vector attenuator and the vector attenuator of the feed forward power amplifier are integrated as one so as to save one vector attenuator. The variable attenuator and relevant control circuit such as the autoamtic gain controller in the preidstortion amplifier are cancelled. The vector attenuator, the control voltage and the loop jointly accomplish the cancelled functions. Thus the invention provides the features of simplified circuits, compact structure, lowering cost and size as well as increasing the reliability.
Description
The present invention relates to linear power amplifying technique field, be specifically related to linear amplification method and device thereof that envelope predistortion and feed forward type amplifier are combined.
Along with the development of global communication business, the spectrum communication resource becomes more and more crowded.In order to effectively utilize frequency spectrum resource more, many communication systems all adopt the higher modulation system of the availability of frequency spectrum, for example QPSK (quadriphase PSK), 8PSK (eight phase shift keyings) or the like.These modulation systems are not only modulated the phase place of carrier wave, the amplitude of also having modulated carrier wave simultaneously, so these modulation systems can produce the non-permanent envelope modulated signal of bigger peak-to-average ratio.And for GMSK (Gaussian Minimum Shift Frequency Keying, Gaussian Minimum Shift-frequency Keying) such permanent envelope modulation, if used multi-transceiver technology, utilize signal combiner with the synthetic broadband signal of the sets of signals of a plurality of carrier waves, also can produce bigger envelope and rise and fall.Bigger peak-to-average ratio has proposed very high linear requirement to the amplifier of radio frequency sending set.This is because power amplifier has inevitable nonlinear characteristic under large-signal, can produce serious intermodulation component and spectrum leakage, brings mutual interference among signals, influences the quality of communication and the capacity of reduction communication system.
How improving the system linearity degree is the common issue with that the communication system expectation solves.In order to solve the problem of the linearity, can adopt two kinds of methods: first method is that whole transmission channel is carried out back-off, makes transmission channel be operated in linear zone, and this method greatly reduces the operating efficiency of system, has increased the cost of base station equipment; Second method is to adopt linearization technique, promptly adopt suitable peripheral circuit, nonlinear characteristic to the passage of posting a letter is proofreaied and correct, thereby present linear amplification effect on the whole to input signal at circuit, this method has been avoided the very big device manufacturing technology of difficulty, adopts the relatively low device of cost, and is not only various informative, and the selection of device is also more flexible, therefore the method that is best suited for from present's view.
Feedforward power amplifier and envelope predistortion (the following predistortion that is called for short sometimes) are two kinds of more effective linearization techniques.
Fig. 1 is the principle schematic of envelope predistortion.Because amplifier nonlinearity, multi-carrier signal can produce harmful intermodulation component IMD (Intermodulation Distortion) through behind the amplifier.At Fig. 1 intermediate power amplifier 112 is to wait to improve linear amplifier, and it produces harmful intermodulation component 113 in amplifying signal.The operation principle of predistortion is as follows: input signal 100 is divided into two-way up and down by power divider 102.One tunnel (following branch road) given automatic gain controller 107 as controlling with reference to REF.Another road (going up branch road) is a primary path.The change in gain that the gain that electricity transfers variable attenuator 104 can change primary path causes with guarantee because variations in temperature etc. is compensated.Give power amplifier 112 from the signal of power divider 102 outputs through behind coupler 106, delay line 108 and the vector attenuator 110.Why being called the vector attenuator is because this attenuator both can change the amplitude (representing with alphabetical A among the figure) of signal, can change the phase place (representing with alphabetical F among the figure) of signal again.The effect of coupler 106 is that a part of power of coupling carries out envelope detection 105, and gives working function generator (WFG) 109 generation predistortion multinomial penalty functions.Vector attenuator 110 produces an intermodulation component 111 in advance under the control of working function generator 109, intermodulation 113 opposite sign but equal magnitude of this intermodulation 111 and power amplifier, the result of addition is that the intermodulation component 111 that makes harmful intermodulation 113 of power amplifier be produced is in advance offset, and reaches the purpose of improving power amplifier linearity.Because intermodulation 111 produced in advance, claim that therefore this linearization technique is predistortion (Pre-Distortion is called for short PD) before power amplifier 112.Certain because various non-ideal factors disturb, and the intermodulation of power amplifier can not be offset fully, remaining intermodulation 114 is called degree of improvement with the ratio that does not improve preceding intermodulation 113.The degree of improvement of predistortion is about 10dB in general.The a part of power of coupler 115 couplings is divided into two-way through power divider 116, one the tunnel (118) sends into Digital Signal Processing (DSP) module 122 after the intermodulation of detecting signal unit detects improves effect information to obtain linearity, by algorithm output control parameter 125 to working function generator (WFG) 109 so that obtain suitable control voltage VAac and VFac; Output VAdc is then sent in the automatic gain controller 107 to adjust 104 gain in another road (120).Dotted line module 123 can be noted by abridging and is pre-distortion power amplifier 124 (PD-PA:Pre-Distortion PowerAmplifier).
Fig. 2 is a typical feedforward linear power amplifier schematic diagram.Main power amplifier (MPA) the 204th among the figure waits to improve linear amplifier, for the linearity of improving it need increase the less error power amplifier (EPA) 213 of power ratio and mainly by the loop of delay line (206,208), vector attenuator (203,212) formation.As seen from Figure 2, the feedforward linear power amplifier system is divided into three parts: the control sections that ring (LOOP) 1, ring (LOOP) 2, the input 214 (narrow-band receiver) that links to each other with coupler 210,211 and automatic control 215 constitute.The function of LOOP1 realization mainly is the intermodulation (IMD) that the extraction signal produces by main power amplifier (MPA), and the function that LOOP2 realizes is that the IMD of amplification LOOP1 generation offsets the IMD in the carrier wave, makes the signal of output comparatively pure, thereby improves the linearity of amplifier.Multi-carrier signal 217 is for treating amplifying signal.Be divided into two-way by coupler 201 and send into LOOP1.Wherein one the tunnel send into main amplifier (MPA) 204.Because MPA204's is non-linear, output signal 218 has just had spuious IMD.Taking out a part of signal through coupler 205 joins at coupler 207 with the spuious carrier wave of sending here from delayer 206 that do not have.By regulating amplitude and the phase place that control voltage D1, D2 regulate vector attenuator 203, make the two-way carrier signal amplitude equal phase that arrives coupler 207 opposite, the signal 219 that provides of LOOP1 just contains IMD in theory like this.In the real process, the precision of signal 219 depends primarily on the meticulous adjusting of D1, the D2 of vector attenuator, and the value of D1, D2 is to be calculated, handled and obtain by the information that automatic control equipment 215 is received according to detecting signal unit 214, and this information has comprised the degree that carrier wave offsets.The IMD signal that is extracted amplifies the back by error amplifier EPA213 and offsets by coupler 209 and the carrier wave that has IMD that was exaggerated, obtain being eliminated carrier signal 221 IMD, that be exaggerated, it is offset precision and sends into automatic control equipment 215 processing through coupler 210 and detecting signal unit 214, and control signal D3, the D4 of output control vector attenuator 212, make the IMD signal amplitude equal phase that contains in the IMD signal that arrives coupler 209 and the carrier signal opposite.Reach the purpose of the carrier wave that improves main power amplifier output at last.Detecting signal unit 214 is narrow-band receivers, intermodulation and carrier wave after it detects LOOP1 and LOOP2 in turn and offset by single-pole double-throw switch (SPDT) K1, and K1 takes turns stream translation by automatic control unit 215 Synchronization Control between LOOP1 and LOOP2.
Above-mentioned predistortion and feed forward method are relatively simple for structure, but the counteracting of IMD is all limited, and linearity degree of improvement is not high, and the degree of improvement of pre-distortion method is at 10～15db, and feed forward method also has only the degree of improvement of 25～30dB.In order to reach the required linearity, usually The combined need be got up use, promptly use the MPA204 in the PD-PA124 alternate figures 2 among Fig. 1, to reach the linearity improvement of 40～45dB.But from Fig. 1 and Fig. 2 as can be known since predistortion circuit and feed forward circuit itself with regard to more complicated, so both circuit of combining complexity more just.Can imagine Fig. 1 and Fig. 2 are rubbed together situation, will feel to have too many things to attend to, messy unclear.Consequently cause product index to worsen, volume increases, and cost increases and reliability reduces.
Purpose of the present invention just is to overcome the shortcoming of prior art, propose a kind of with pre-distortion method and feed forward method combine but realize relative simple, cost is lower, reliability increases linear power amplification method.
Another object of the present invention is to propose a kind of simple in structure, that volume is less, that cost is lower, reliability increases linear power amplifier of realizing above-mentioned linear power amplification method.
For achieving the above object, the present invention proposes a kind of linear power amplification method, may further comprise the steps:
A, with the input carrier signal be coupled into first input carrier signal and second input carrier signal;
The amplitude and the phase place of b, adjustment first input carrier signal produce an intermodulation signal simultaneously in advance;
C, main power amplifier amplify adjusted described first input carrier signal, and the intermodulation component that produces with described intermodulation signal that produces in advance and main power amplifier is offset simultaneously;
First input carrier signal and unmatched intact intermodulation component after d, the amplification are divided into two parts, and a part is coupled to extract the unmatched intact intermodulation signal in first input carrier signal with second input carrier signal;
E, the amplitude of adjusting the intermodulation signal extract and phase place make it with amplify after first input carrier signal in unmatched intact intermodulation component amplitude equal phase opposite;
F, adjusted intermodulation signal are coupled through another part that error amplifier amplifies back and first input carrier signal that has amplified, offsetting intermodulation component wherein, acquisition outgoing carrier signal.
It is characterized in that: described step b adjusts the amplitude of first input carrier signal and phase place and the pre-intermodulation signal that produces according to the intermodulation signal that steps d extracts, and detailed process is:
1) carries out intermodulation after the intermodulation signal coupling part that steps d is extracted and detect, detect intermodulation signal;
2) digital processing element to extract the effect information of intermodulation signal and output algorithm control parameter D 1 and D2 and weighted signal according to the intermodulation signal in the detected incoming carrier;
3) the working function generator is according to control alternating voltage (VAac) of the envelope signal generation amplitude in described weighted information and the input carrier signal and phase control alternating voltage (VFac);
4) described amplitude control alternating voltage (VAac) and phase control alternating voltage (VFac) are controlled voltage (VA) and phase control voltage (VF) to vector attenuator output amplitude respectively with after algorithm controls parameter D 1 and the D2 addition;
5) the vector attenuator is adjusted the amplitude and the phase place of first input carrier signal under the control of described amplitude control voltage (VA) and phase control voltage (VF), makes that first input carrier signal after main power amplifier amplifies is opposite with the amplitude equal phase of second input carrier signal; Adjust the amplitude and the phase place of the pre-intermodulation signal that produces simultaneously, the intermodulation signal that makes pre-intermodulation signal that produces and main power amplifier produce is offset to greatest extent.
Wherein step e carries out according to the outgoing carrier signal intermodulation signal amplitude and phase place adjustment, and detailed process is:
1) carries out intermodulation after the outgoing carrier signal coupling part of step f being obtained and detect, detect the remaining intermodulation component in the outgoing carrier signal;
2) obtain the linearisation effect information of outgoing carrier signal according to detected intermodulation component, and export control parameter D 3 and D4, control the amplitude adjustment and the phase place adjustment of intermodulation signal respectively.
Wherein in the control procedure that the amplitude of first input carrier signal and phase place and the pre-intermodulation signal that produces are adjusted, described step 4) with described amplitude control alternating voltage (VAac) and phase control alternating voltage (VFac) respectively with algorithm controls parameter D 1 and D2 addition after, also have one addition result carried out step every straight processing, and then to vector attenuator output amplitude control voltage (VA) and phase control voltage (VF).
For realizing goal of the invention, the present invention also provides a kind of linear power amplifying device of realizing above-mentioned linear power amplification method, and this device comprises:
Loop one, the intermodulation signal that produces the generation of an intermodulation signal and main power amplifier is in advance offset, and extracts the unmatched intermodulation signal that finishes;
Loop two amplifies the back with the unmatched intermodulation signal that extracts and offsets with the intermodulation component in the input carrier signal, to obtain the outgoing carrier signal that does not contain intermodulation component;
The control access is according to the vector attenuator in carrier component in the unmatched intermodulation signal of loop one extraction or the difference of the intermodulation component in the outgoing carrier signal control loop one and the amplitude and the phase place of the vector attenuator in the loop two;
Described control access comprises the 6th coupler, the 7th coupler, selector switch, local oscillation signal generator, detecting signal unit, digital processing element, it is characterized in that also comprising working function generator, first adder and second adder; The intermodulation signal coupling part that the 6th coupler is responsible for loop one is extracted comes out to offer the control access, the 7th coupler is responsible for an outgoing carrier signal coupling part is come out to offer the control access, selector switch is respectively by connecting the 6th coupler, the 7th coupler makes control access respectively the vector attenuator in the control loop one and the vector attenuator in the loop two, the local oscillation signal generator changes to lower frequency with signal so that detect, detecting signal unit detects carrier signal or the intermodulation signal in the control access, digital processing element is finished the algorithm computing, the working function generator computes weighted input carrier signal through after the envelope detection, first adder and second adder are finished voltage addition function respectively.
Wherein said loop one comprises: first coupler is coupled into first input carrier signal and second input carrier signal with input carrier signal; The vector attenuator is adjusted the amplitude and the phase place of first input carrier signal, and produces an intermodulation signal in advance, to offset the intermodulation signal that produces in the main power amplifier; Main power amplifier amplifies first input carrier signal; First delayer is delayed time second input carrier signal; The 4th coupler is coupled first input carrier signal after second input carrier signal after the time-delay and the amplification of main power amplifier, to extract the intermodulation signal in the carrier signal.
Wherein said loop two comprises: second delayer, first incoming carrier after the main power amplifier amplification is delayed time; The vector attenuator, the amplitude and the phase place of the intermodulation signal that the 4th coupler is extracted are adjusted; The error power amplifier amplifies the adjusted intermodulation signal of vector attenuator; The 5th coupler is coupled first input carrier signal of second delayer output and the intermodulation signal of error power amplifier output, to offset the intermodulation signal in first input carrier signal, obtains the outgoing carrier signal.
Wherein said detecting signal unit is a narrow-band receiver.
Because the present invention unites two into one the vector attenuator of predistortion and the vector attenuator of feed forward power amplifier, has omitted a vector attenuator like this.Utilize the characteristics of feedforward loop circuit simultaneously, transfer variable attenuator and relevant control circuit such as automatic gain controller thereof to cancel electricity in the predistortion amplifier, its function is finished jointly by vector attenuator, control voltage and loop one Loop1.The gain that its effect is equivalent to pair amplifier fully compensates automatically.In addition when selecting K switch 1 selection to be connected with the 7th coupler, narrow-band receiver is except the incoming carrier counteracting information that can receive Loop1, can also send into the criterion of digital processing element as the output intermodulation situation that detects main power amplifier as algorithm optimization.Therefore, the characteristics that improvement linear power amplifying device provided by the invention and amplification method thereof have circuit reduction, save device, compact conformation can reduce cost, reduce the amplifier volume, increase reliability of products.
Fig. 1 is existing predistortion principle block diagram;
Fig. 2 is existing typical feedforward linear power amplifier theory diagram;
Fig. 3 is an embodiment of the invention theory diagram.
Below in conjunction with drawings and Examples the present invention is described in detail.
Fig. 1 and Fig. 2 have been described in detail in front, therefore repeat no more.
Fig. 3 shows a preferred embodiment of the present invention, and as shown in the figure, linear power amplifying device comprises loop one (Loop1), loop two (Loop2) and a control access.Its intermediate ring road one (Loop1) comprises first coupler 301, and input carrier signal is coupled into first input carrier signal and second input carrier signal; Vector attenuator 303 is adjusted the amplitude and the phase place of first input carrier signal, and produces an intermodulation signal in advance, to offset the intermodulation signal that produces in the main power amplifier 304; Main power amplifier (PA) 304 amplifies first input carrier signal; First delayer (DL1) 306 is delayed time second input carrier signal; The 4th coupler 307 is coupled first input carrier signal after second input carrier signal after the time-delay and main power amplifier (PA) 304 amplifications, to extract the intermodulation signal in the carrier signal.Therefore the main effect of loop one (Loop1) is to produce in advance an intermodulation signal and offsets with the intermodulation signal of main power amplifier 304 generations, and extracts the unmatched intermodulation signal that finishes.Loop two comprises second delayer 308, and first incoming carrier after main power amplifier 304 is amplified is delayed time; Vector attenuator 312, the amplitude and the phase place of the intermodulation signal that the 4th coupler 307 is extracted are adjusted; Error power amplifier 313 amplifies vector attenuator 312 adjusted intermodulation signals; The 5th coupler 309 is coupled first input carrier signal of second delayer, 308 outputs and the intermodulation signal of error power amplifier 313 outputs, to offset the intermodulation signal in first input carrier signal, obtains the outgoing carrier signal.Therefore the main effect of loop two (Loop2) is that the unmatched intermodulation signal that will extract amplifies the back and offsets with the intermodulation component in the input carrier signal, to obtain the outgoing carrier signal that does not contain intermodulation component.The control access comprises the 6th coupler 311, the 7th coupler 310, selector switch K1, local oscillation signal generator 319, detecting signal unit 318 and digital processing element 317, in addition also comprises a working function generator 316, first adder 314 and second adder 315; The intermodulation signal coupling part that the 6th coupler 311 is responsible for loop one is extracted comes out to offer the control access, the 7th coupler 310 is responsible for an outgoing carrier signal coupling part is come out to offer the control access, selector switch K1 is respectively by connecting the 6th coupler 311, the 7th coupler 310 makes control access respectively the vector attenuator 303 in the control loop one and the vector attenuator 312 in the loop two, local oscillation signal generator 319 changes to lower frequency with signal so that detect, carrier signal or intermodulation signal that detecting signal unit 318 detects in the control access, it can be a narrow-band receiver, digital processing element 317 is finished the algorithm computing, working function generator 316 computes weighted the input carrier signal that the 3rd coupler 302 is coupled out through after the envelope detection, first adder 314 and second adder 315 are respectively with direct current and alternating voltage addition.Therefore the control access is amplitude and the phase place according to two the vector attenuators 303,312 in the carrier component in the unmatched intermodulation signal of loop one (Loop1) extraction or difference control loop one (Loop1) of the intermodulation component in the outgoing carrier signal and the loop two (Loop2).
Below in conjunction with linear power amplifying device linear power amplification method of the present invention is elaborated.
As shown in Figure 3, linear power amplification method may further comprise the steps:
A, first coupler 301 are divided into first input carrier signal and second input carrier signal two parts with the carrier signal of input, vector attenuator 303, the second input carrier signals that first input carrier signal is input in the loop one (Loop1) are exported to the 4th coupler 307 after the time-delay of first delayer 306;
The amplitude and the phase place of b, adjustment first input carrier signal, the pre-simultaneously intermodulation signal that produces;
Vector attenuator 303 in the loop one has two functions, under the control of digital processing element 317, produce an intermodulation signal in advance as the vector attenuator in the predistortion on the one hand, and adjust its amplitude and phase place, under the control of digital processing element 317, adjust the amplitude and the phase place of first input carrier signal on the other hand as the vector attenuator in the feedforward power amplifier, make that first input carrier signal and second input carrier signal are offset fully in the 4th coupler 307, obtain purer intermodulation signal.
To the amplitude of first input carrier signal and phase place and to the amplitude and the phase place adjustment of the intermodulation signal of pre-generation is to adjust by the control access and according to the intermodulation signal that loop one extracts, and detailed process is:
1) selector switch K1 selects the control access to be connected with the 6th coupler 311, the intermodulation signal that loop one is extracted carries out intermodulation after by the 6th coupler 311 coupling parts and detects, detect the input carrier signal in the intermodulation signal, wherein local oscillation signal generator 319 changes to lower frequency with signal so that detect;
2) digital processing element to extract the effect information of intermodulation signal and output algorithm control parameter D 1 and D2 and weighted signal 321 according to the intermodulation signal in the detected incoming carrier;
3) working function generator 316 input carrier signal that the 3rd coupler 302 is coupled out carries out carrying out computing generation amplitude control alternating voltage (VAac) and phase control alternating voltage (VFac) with weighted signal 321 after the envelope detection;
4) described amplitude control alternating voltage (VAac) and phase control alternating voltage (VFac) are controlled voltage (VA) and phase control voltage (VF) to vector attenuator 303 output amplitudes respectively after first adder 314 and second adder 315 and algorithm controls parameter D 1 and D2 addition, for the influence of flip-flop in minimizing amplitude control alternating voltage (VAac) and the phase control alternating voltage (VFac), can carry out after straight processing, sending into first, second adder 314,315 again;
5) vector attenuator 303 is adjusted the amplitude and the phase place of first input carrier signal under the control of amplitude control voltage (VA) and phase control voltage (VF), make that the amplitude equal phase of first, second input carrier signal is opposite in the 4th coupler 307, adjust the amplitude and the phase place of the pre-intermodulation signal that produces simultaneously, the intermodulation signal that makes pre-intermodulation signal that produces and main power amplifier (PA) 304 produce is offset to greatest extent.
C, main power amplifier (PA) 304 amplify vector attenuator 303 adjusted first input carrier signals, and the intermodulation signal that produces in advance with vector attenuator 303 and the intermodulation component of main amplifier 304 generations are offset simultaneously.Although vector attenuator 303 amplitude and phase place to the intermodulation signal of pre-generation under the control of control access adjusted, harmful intermodulation component that winner's power amplifier 304 is produced is offset to greatest extent, but still can have certain intermodulation component in the carrier signal.Therefore also need to do further elimination by loop two;
First input carrier signal and unmatched intact intermodulation component after d, the amplification are divided into two parts at second coupler 305, and a part is coupled to extract the unmatched intact intermodulation signal in first input carrier signal at the 4th coupler 307 and second input carrier signal after 306 time-delays of first delayer;
Vector attenuator 312 in e, the loop two under the control of control access, adjust the intermodulation signal amplitude that extracts and phase place make it with amplify after first input carrier signal in unmatched intact intermodulation component amplitude equal phase opposite.The control access is come vector attenuator 312 is controlled according to output signal, and detailed process is:
1) selector switch K1 selects to be connected with the 7th coupler 310, by the 7th coupler 310 the outgoing carrier signal is coupled and exports to detecting signal unit 318 after the part and carry out the intermodulation detection, detects the remaining intermodulation component in the outgoing carrier signal;
2) digital processing element 317 obtains the linearisation effect information of outgoing carrier signal according to detected intermodulation component, and output control parameter D 3 and D4, the amplitude and the phase place of the intermodulation signal of 312 pairs the 4th couplers of the vector attenuator in the control loop two 307 output are adjusted respectively, make it opposite with unmatched intact intermodulation component amplitude equal phase in the input carrier signal.
F, vector attenuator 312 adjusted intermodulation signals are coupled at the 5th coupler 309 with first input carrier signal of delaying time through second delayer (DL2) 308 after error amplifier 313 amplifies, with counteracting intermodulation component wherein, thereby make the intermodulation component in the outgoing carrier signal drop to minimum value.
As mentioned above, to be (1) with the vector attenuator of the vector attenuator of predistortion and feed forward power amplifier unite two into one main feature of the present invention becomes the vector attenuator, can omit a vector attenuator like this.Wherein the control voltage VA of vector attenuator is made up of the D1 of feedforward loop circuit one Loop1 and the VAac addition of predistortion, and the control voltage VF of vector attenuator is made up of the D2 of feedforward loop circuit one Loop1 and the VFac addition of predistortion.Because relative VAac with D2 of D1 and VFac can be considered as direct current, therefore can utilize D1 and D2 control vector attenuator that loop one Loop1 is adjusted, finish the function of Fig. 2 feedforward; Therefore the relative D1 with VFac of VAac and D2 can utilize VAac and VFac control vector attenuator for exchanging, and plays the effect of predistortion among Fig. 1.Therefore the change of Fig. 3 is of equal value fully.(2) utilize the characteristics of feedforward loop circuit, electricity among Fig. 1 is transferred variable attenuator 104 and relevant control circuit such as automatic gain controller 107 cancellations thereof, its function is finished jointly by vector attenuator, control voltage D1 and loop one Loop1.When D1 controlled the vector attenuator, the gain that its effect is equivalent to pair amplifier fully compensated automatically, so the change among Fig. 3 and Fig. 1 are equivalences fully.(3) when selecting K switch 1 selection to be connected with the 7th coupler, narrow-band receiver is except the incoming carrier counteracting information that can receive Loop1, can also send into the criterion of digital processing element as the output intermodulation situation that detects main power amplifier as algorithm optimization.Therefore, the characteristics that improvement linear power amplifying device provided by the invention and amplification method thereof have circuit reduction, save device, compact conformation can reduce cost, reduce the amplifier volume, increase reliability of products.
Claims (7)
1, a kind of linear power amplification method may further comprise the steps:
A, with the input carrier signal be coupled into first input carrier signal and second input carrier signal;
The amplitude and the phase place of b, adjustment first input carrier signal produce an intermodulation signal simultaneously in advance;
C, main power amplifier (304) amplify adjusted described first input carrier signal, and the intermodulation component that produces with described intermodulation signal that produces in advance and main power amplifier (304) is offset simultaneously;
First input carrier signal and unmatched intact intermodulation component after d, the amplification are divided into two parts, and a part is coupled to extract the unmatched intact intermodulation signal in first input carrier signal with second input carrier signal;
E, the amplitude of adjusting the intermodulation signal extract and phase place make it with amplify after first input carrier signal in unmatched intact intermodulation component amplitude equal phase opposite;
F, adjusted intermodulation signal are coupled through another part that error amplifier amplifies back and first input carrier signal that has amplified, offsetting intermodulation component wherein, acquisition outgoing carrier signal;
It is characterized in that: described step b adjusts the amplitude of first input carrier signal and phase place and the pre-intermodulation signal that produces according to the intermodulation signal that steps d extracts, and detailed process is:
1) carries out intermodulation after the intermodulation signal coupling part that steps d is extracted and detect, detect intermodulation signal;
2) digital processing element (317) to extract the effect information of intermodulation signal and output algorithm control parameter D 1 and D2 and weighted signal according to the intermodulation signal in the detected incoming carrier;
3) working function generator (316) is according to control alternating voltage (VAac) of the envelope signal generation amplitude in described weighted information and the input carrier signal and phase control alternating voltage (VFac);
4) described amplitude control alternating voltage (VAac) and phase control alternating voltage (VFac) are controlled voltage (VA) and phase control voltage (VF) to vector attenuator (303) output amplitude respectively with after algorithm controls parameter D 1 and the D2 addition;
5) vector attenuator (303) is adjusted the amplitude and the phase place of first input carrier signal under the control of described amplitude control voltage (VA) and phase control voltage (VF), makes that first input carrier signal after main power amplifier (304) amplifies is opposite with the amplitude equal phase of second input carrier signal; Adjust the amplitude and the phase place of the pre-intermodulation signal that produces simultaneously, the intermodulation signal that makes pre-intermodulation signal that produces and main power amplifier produce is offset to greatest extent.
2, linear power amplification method as claimed in claim 1 is characterized in that step e carries out according to the outgoing carrier signal intermodulation signal amplitude and phase place adjustment, and detailed process is:
1) carries out intermodulation after the outgoing carrier signal coupling part of described step f being obtained and detect, detect the remaining intermodulation component in the outgoing carrier signal;
2) obtain the linearisation effect information of outgoing carrier signal according to detected intermodulation component, and export control parameter D 3 and D4, control the amplitude adjustment and the phase place adjustment of intermodulation signal respectively.
3, linear power amplification method as claimed in claim 1 or 2, in the control procedure that it is characterized in that the amplitude of first input carrier signal and phase place and the pre-intermodulation signal that produces are adjusted, described step 4) with described amplitude control alternating voltage (VAac) and phase control alternating voltage (VFac) respectively with algorithm controls parameter D 1 and D2 addition after, also have one addition result carried out step every straight processing, and then to vector attenuator output amplitude control voltage (VA) and phase control voltage (VF).
4, a kind of linear power amplifying device of realizing the described linear power amplification method of claim 1, this device comprises:
Loop one (Loop1), the intermodulation signal that produces the generation of an intermodulation signal and main power amplifier (304) is in advance offset, and extracts the unmatched intermodulation signal that finishes;
Loop two (Loop2) amplifies the back with the unmatched intermodulation signal that extracts and offsets with the intermodulation component in the input carrier signal, to obtain the outgoing carrier signal that does not contain intermodulation component;
The control access is according to the vector attenuator (303) in carrier component in the unmatched intermodulation signal of loop one (Loop1) extraction or the difference control loop one of the intermodulation component in the outgoing carrier signal (Loop1) and the amplitude and the phase place of the vector attenuator (312) in the loop two (Loop2);
Described control access comprises the 6th coupler (311), the 7th coupler (310), selector switch (K1), local oscillation signal generator (319), detecting signal unit (318), digital processing element (317), it is characterized in that also comprising working function generator (316), first adder (314) and second adder (315); The intermodulation signal coupling part that the 6th coupler (311) is responsible for loop one (Loop1) is extracted comes out to offer the control access, the 7th coupler (310) is responsible for an outgoing carrier signal coupling part is come out to offer the control access, selector switch (K1) is respectively by connecting the 6th coupler (311), the 7th coupler (310) makes control access respectively the vector attenuator (303) in the control loop one and the vector attenuator (312) in the loop two, local oscillation signal generator (319) changes to lower frequency with signal so that detect, detecting signal unit (318) detects carrier signal or the intermodulation signal in the control access, digital processing element (317) is finished the algorithm computing, working function generator (316) computes weighted input carrier signal through after the envelope detection, first adder (314) and second adder (315) are finished voltage addition function respectively.
5, linear power amplifying device as claimed in claim 4, it is characterized in that loop one (Loop1) comprising: first coupler (301) is coupled into first input carrier signal and second input carrier signal with input carrier signal; Vector attenuator (303) is adjusted the amplitude and the phase place of first input carrier signal, and produces an intermodulation signal in advance, to offset the intermodulation signal that produces in the main power amplifier (304); Main power amplifier (304) amplifies first input carrier signal; First delayer (306) is delayed time second input carrier signal; The 4th coupler (307) is coupled first input carrier signal after second input carrier signal after the time-delay and main power amplifier (304) amplification, to extract the intermodulation signal in the carrier signal.
6,, it is characterized in that described loop two (Loop2) comprising as claim 4 or 5 described linear power amplifying devices: second delayer (308), first incoming carrier after main power amplifier (304) amplification is delayed time; Vector attenuator (312), the amplitude and the phase place of the intermodulation signal that the 4th coupler (307) is extracted are adjusted; Error power amplifier (313) amplifies the adjusted intermodulation signal of vector attenuator (312); The 5th coupler (309) is coupled first input carrier signal of second delayer (308) output and the intermodulation signal of error power amplifier (304) output, to offset the intermodulation signal in first input carrier signal, obtains the outgoing carrier signal.
7, linear power amplifying device as claimed in claim 4 is characterized in that described detecting signal unit (318) is a narrow-band receiver.
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| CNB011213442A CN1158824C (en) | 2001-06-01 | 2001-06-01 | Linear power amplifying method and device |
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| CNB011213442A CN1158824C (en) | 2001-06-01 | 2001-06-01 | Linear power amplifying method and device |
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| CN1158824C CN1158824C (en) | 2004-07-21 |
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| CNB011213442A Expired - Fee Related CN1158824C (en) | 2001-06-01 | 2001-06-01 | Linear power amplifying method and device |
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| WO2006079241A1 (en) * | 2005-01-25 | 2006-08-03 | Zte Corporation | Predistortion device based on vector envelope injection and the method thereof |
| CN1328920C (en) * | 2003-01-17 | 2007-07-25 | 中兴通讯股份有限公司 | Method and equipment for implementing digital loop control of feed-forward power amplifier |
| CN101567667B (en) * | 2009-04-24 | 2011-10-19 | 福建三元达通讯股份有限公司 | Enhancement type analog predistortion linear power amplifier |
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| CN101594337B (en) * | 2008-05-27 | 2013-01-23 | 京信通信系统（中国）有限公司 | Device for generating pre-distorted signals |
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| CN106646287A (en) * | 2016-12-20 | 2017-05-10 | 中国科学院上海微系统与信息技术研究所 | Trend elimination based large dynamic range data acquisition device and method |
| CN106646287B (en) * | 2016-12-20 | 2019-02-26 | 中国科学院上海微系统与信息技术研究所 | A kind of Larger Dynamic range data acquisition device and method based on trend elimination |
| WO2019227295A1 (en) * | 2018-05-28 | 2019-12-05 | 华为技术有限公司 | Signal processing device and signal processing method |
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