CN103312274A - Digital control method for feedforward amplifier and digitalized feedforward amplifier - Google Patents
Digital control method for feedforward amplifier and digitalized feedforward amplifier Download PDFInfo
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- CN103312274A CN103312274A CN2012100716722A CN201210071672A CN103312274A CN 103312274 A CN103312274 A CN 103312274A CN 2012100716722 A CN2012100716722 A CN 2012100716722A CN 201210071672 A CN201210071672 A CN 201210071672A CN 103312274 A CN103312274 A CN 103312274A
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Abstract
The invention discloses a digital control method for a feedforward amplifier and a digitalized feedforward amplifier. The method comprises the steps: digital input signals are divided into two paths in a constant-amplitude and equiphase mode, wherein one path is digital signals A, and the other path is digital signals B; the digital signals A are subjected to power amplification to obtain analog signals A after being subjected to digital-analog sampling transformation and frequency mixing processing; partial analog signals A are sampled to be subjected to frequency mixing processing and analog-digital sampling transformation to obtain digital signals C; according to the digital signals C and the digital signals B, error signals are obtained; the error signals are subjected to digital-analog sampling transformation and frequency mixing processing to obtain analog signals B; and the analog signals A and the analog signals B are coupled to obtain linear output signals. A digitalized feedforward amplifier system which is manufactured according to the method can generate amplifying signals with superhigh linearity; and the digitalized feedforward amplifier system disclosed by the invention is simple in structure and simple and convenient to operate.
Description
Technical field
The present invention relates to the communication network technology field, particularly a kind of digital control method of feed-forward amplifier and digitlization feed-forward amplifier.
Background technology
Increasing sharply of current honeycomb and personal communication network (PCN) makes frequency spectrum more crowded.Particularly the bandwidth that proposes of third generation mobile radio system is widened, and it is large that dynamic range becomes, and power stage increases, and bandwidth, the linearity and the efficient of high power amplifier has been had higher requirement.Therefore, research and creation linearity amplifier system high, that efficient is high seem extremely meaningful.
For feed-forward technique, comparative maturity is the simulation feedforward system at present.Accompanying drawing 1 is the structure of simulation feedforward system.The two-tone signal of input is divided into identical two paths of signals through behind the power splitter, and the signal of setting out on a journey can be superimposed with crosstalk and noise signal owing to the non-linear generation of power amplifier after amplifying through main power amplifier, and it is output as V
Main=KV
In+ V
Non+ V
NFIf the time delay of time delay device equals the time delay of main power amplifier, and the coupling coefficient of coupler C1 equals the gain of amplifier, so from subtracter signal out only the information of remaining noise and intermodulation signal be V
Errin=(V
Non+ V
NF)/C1 uses error amplifier (supposing that error amplifier is fully linear and can not introduces noise) that this signal is amplified again and obtains V
Errout=K
Err(V
Non+ V
NF)/C1.When the multiplication factor of error amplifier equals coupling coefficient long-pending of coupler C1 and coupler C2, last being output as:
It has good linear effects.But, realize the alignment of accurate time delay, its system very complex and be difficult to debugging.In addition, because the Insertion Loss of error amplifier and power amplifier back delayer, so that the efficient of feedforward system is extremely low.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of digital control method of feed-forward amplifier is provided.
Another object of the present invention is to provides the amplifier system digitlization that a kind of linearity is high, simple, efficient is high feed-forward amplifier in conjunction with the characteristic of digital system.
Purpose of the present invention realizes by following technical proposals: a kind of digital control implementation method of feed-forward amplifier comprises the steps:
A kind of digital control method of feed-forward amplifier is characterized in that comprising the steps:
With digital input signals constant amplitude, equiphase two-way that is divided into, the one tunnel is digital signal A, and one the tunnel is digital signal B;
Digital signal A is carried out power amplification obtain analog signal A after digital-to-analogue is sampled conversion, Frequency mixing processing;
Sampling part analog signal A obtains digital signal C through Frequency mixing processing, modulus sampling conversion;
Obtain error signal according to digital signal C and digital signal B;
Error signal after sampling conversion, Frequency mixing processing, digital-to-analogue is obtained analog signal B;
Analog signal A and analog signal B coupling are obtained linear output signal.
A kind of digitlization feed-forward amplifier comprises digital signal divider, feedforward controller, digital to analog converter A, digital to analog converter B, analog to digital converter, frequency mixer A, frequency mixer B, frequency mixer C, power amplifier, time-delay adjuster A, coupler A, coupler B; The output of described digital signal divider connects respectively the input of feedforward controller and the input of time-delay adjuster A, the output of described time-delay adjuster A is linking number weighted-voltage D/A converter B, frequency mixer B, power amplifier, coupler A successively, the input of described coupler A output difference butt coupling device B and the input of frequency mixer C, the output of described frequency mixer C connects the input of feedforward controller through analog to digital converter, the output of described feedforward controller is linking number weighted-voltage D/A converter A, frequency mixer A successively, the input of described frequency mixer A butt coupling device B.
The present invention has following advantage and effect with respect to prior art:
(1) the present invention makes by the feed-forward technique digitlization with amplifier that to obtain the amplifying signal linearity high, simple in structure, easy and simple to handle.
(2) the present invention can also be combined with other linearity of amplifier technology and be formed the Combination linear technique, thereby obtains the better amplifier system of the linearity.
Description of drawings
Fig. 1 is the theory diagram of simulation feedforward system.
Fig. 2 is the digital control implementation method flow chart of the feed-forward amplifier of the embodiment of the invention.
Fig. 3 is the digitlization feed-forward amplifier block diagram of the embodiment of the invention.
Fig. 4 is the feedforward controller block diagram among Fig. 3.
Fig. 5 is Fig. 4 calculator block diagram.
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 to this.
Embodiment
Because the simulation feed-forward technique of amplifier requires the accurate control of amplitude and time delay so that feedforward system is extremely complicated; In addition, need an extra error amplifier, so that the efficient of system is lower.And digital system does being more prone to compared with analogue system aspect amplitude and the phase control, and do not need error amplifier.Feed forward amplifier system the most important thing is to find out accurately amplifier because the crosstalk of the non-linear generation of power amplifier and amplitude, the time delay of noise signal.Then from main power amplifier, deduct distorted signal and noise signal with subtracter, thereby so that power amplifier has good linearity.
As shown in Figure 2, the Digital Implementation method of a kind of feed-forward amplifier of the present invention comprises the steps:
Step S100: with digital input signals constant amplitude, equiphase two-way that is divided into, one the tunnel is digital signal A, and one the tunnel is digital signal B, and the realization of this step is fairly simple, only need input signal is copied portion as digital signal B, original signal gets final product as digital signal A;
Step S200: digital signal A is carried out power amplification obtain analog signal A after digital-to-analogue is sampled conversion, Frequency mixing processing; Described analog signal is because amplifier nonlinearity can exist amplitude and the time delay of crosstalk and noise signal.
Step S300: sampling part analog signal A obtains digital signal C through Frequency mixing processing, modulus sampling conversion;
Step S400: obtain error signal according to digital signal C and digital signal B effect, described error signal is above-mentioned crosstalk signal and noise signal owing to the non-linear generation of power amplifier;
Step S500: error signal is obtained analog signal B after digital-to-analogue is sampled conversion, Frequency mixing processing; Wherein, before error signal carried out digital-to-analogue sampling conversion, generally also to carry out time delay adjustment, phase place adjustment, amplitude adjustment to error signal, wherein, the phase place adjustment is that phase place is adjusted 180 °, and so that the analog signal B that obtains through adjustment equates with analog signal A amplitude, 180 ° of phase phasic differences;
Step S600: analog signal A and analog signal B coupling are obtained linear output signal, and the output signal that obtain this moment has been offset crosstalk signal and the noise signal owing to the non-linear generation of power amplifier, and the linearity is very high.
Described step S400 comprises the steps:
Step S401: be adjusted to amplitude and the time delay of digital signal C consistent with amplitude and the time delay of digital signal B; Because digital signal C has certain time delay with respect to digital signal B, so should carry out the time delay adjustment, in addition, obtain error signal in order to offset digital signal B, also should carry out the amplitude adjustment so that it is identical with digital signal B amplitude to digital signal C;
Step S402: the signal that step S401 is obtained and digital signal B do subtraction and obtain the error signal that is comprised of the crosstalk signal of the non-linear generation of power amplifier and noise signal etc.
When real work, cause the variation of time delay character for the variation of eliminating temperature, described step S400 also comprises the steps:
The count variance of word signal C and digital signal B of timing ga(u)ge;
Judge that whether described variance is greater than preset value;
If readjust time delay, so that described variance, is eliminated variations in temperature less than preset value to the impact of time delay.
As shown in Figure 3, digitlization feed-forward amplifier of the present invention comprises digital signal divider, feedforward controller, digital to analog converter A, digital to analog converter B, analog to digital converter, frequency mixer A, frequency mixer B, frequency mixer C, power amplifier, time-delay adjuster A, coupler A, coupler B; The output of described digital signal divider connects respectively the input of feedforward controller and the input of time-delay adjuster A, the output of described time-delay adjuster A is linking number weighted-voltage D/A converter B, frequency mixer B, power amplifier, coupler A successively, the input of described coupler A output difference butt coupling device B and the input of frequency mixer C, the output of described frequency mixer C connects the input of feedforward controller through analog to digital converter, the output of described feedforward controller is linking number weighted-voltage D/A converter A, frequency mixer A successively, the input of described frequency mixer A butt coupling device B.
In the specific implementation, above-mentioned feedforward controller can select mode shown in Figure 4 to realize, be that feedforward controller can comprise digital gain adjusting device B, time-delay adjuster B, calculator, phase regulator, the digital gain adjusting device A that connects successively, described calculator input connects the output of digital signal divider, the output of described digital gain adjusting device B input connection mode number converter, described calculator comprises subtracter as shown in Figure 5.
Described digital signal divider is with the digital signal constant amplitude of input, equiphase two paths of signals that is divided into, one road signal is directly inputted feedforward controller, another road signal is successively through time-delay adjuster A, digital to analog converter B, frequency mixer B, the analog signal that obtains amplifying after the power amplifier effect, the analog signal of described amplification after coupler A sampling more successively through frequency mixer C, analog to digital converter, digital gain adjusting device B, carry out obtaining error signal behind the subtraction at subtracter with the signal of directly inputting feedforward controller behind the time-delay adjuster B, described error signal is more successively through phase regulator, digital gain adjusting device A, digital to analog converter A, obtain behind the frequency mixer A equating with the analogue signal amplitude of amplifying, the signal that the phase phasic difference is 180 °, the analog signal of this signal and amplification obtains high linear signal after coupler B coupling.
In the specific implementation, the adjuster A that delays time first is set to zero, adjusts time-delay adjuster B and digital gain adjusting device B so that only there is error signal information in the subtracter output in the feedforward controller, and the adjustment amount of establishing time-delay adjuster B is Δ T2.Adjust again time-delay adjuster A, time-delay adjuster B, make that the signal of frequency mixer A output equates with the signal intermodulation amplitude that power amplifier is exported, 180 ° of phase phasic differences.This time adjusting time-delay adjuster A, time-delay adjuster B should be simultaneously, if the adjustment amount of time-delay adjuster A is Δ T1, the adjuster B that then delays time also regulates Δ T1 again, and making last total adjustment amount is Δ T1+ Δ T2.At last Δ T1 is write time-delay adjuster A, Δ T1+ Δ T2 writes time-delay adjuster B.
Because when real work, the variation of temperature can cause the variation of each device time delay character, thereby greatly affects the performance of system.Therefore, as shown in Figure 5, also be provided with variance calculator at described calculator, described variance calculator is for the variance of the signal of the signal that calculates described direct input feedforward controller and time-delay adjuster B output, and judge that whether described variance is greater than preset value, if forward delay interval is adjusted instruction, after receiving instruction, time-delay adjuster A and time-delay adjuster B re-start adjustment.The order of adjusting is regulated time-delay adjuster A again for adjusting first time-delay adjuster B.
Above-described embodiment of the present invention does not consist of the restriction to protection range of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (9)
1. the digital control method of a feed-forward amplifier is characterized in that comprising the steps:
With digital input signals constant amplitude, equiphase two-way that is divided into, the one tunnel is digital signal A, and one the tunnel is digital signal B;
Digital signal A is carried out power amplification obtain analog signal A after digital-to-analogue is sampled conversion, Frequency mixing processing;
Sampling part analog signal A obtains digital signal C through Frequency mixing processing, modulus sampling conversion;
Obtain error signal according to digital signal C and digital signal B;
Error signal after sampling conversion, Frequency mixing processing, digital-to-analogue is obtained analog signal B;
Analog signal A and analog signal B coupling are obtained linear output signal.
2. the digital control implementation method of described feed-forward amplifier according to claim 1 is characterized in that describedly obtaining error signal according to digital signal C and digital signal B and comprising step:
Be adjusted to amplitude and the time delay of digital signal C consistent with amplitude and the time delay of digital signal B;
Digital signal C after adjusting and digital signal B are done subtraction obtain error signal.
3. the digital control implementation method of described feed-forward amplifier according to claim 1 is characterized in that error signal is comprised step before digital-to-analogue sampling conversion: described error signal is carried out time delay adjustment, phase place adjustment, amplitude adjustment.
4. the digital control implementation method of described feed-forward amplifier according to claim 3 is characterized in that described phase place adjustment is that phase place is adjusted 180 °.
5. according to claim 1 to the digital control implementation method of one of 4 described feed-forward amplifiers, it is characterized in that describedly obtaining error signal according to digital signal C and digital signal B and comprising step:
The count variance of word signal C and digital signal B of timing ga(u)ge;
Judge that whether described variance is greater than preset value;
If readjust time delay.
6. digitlization feed-forward amplifier, it is characterized in that, comprise digital signal divider, feedforward controller, digital to analog converter A, digital to analog converter B, analog to digital converter, frequency mixer A, frequency mixer B, frequency mixer C, power amplifier, time-delay adjuster A, coupler A, coupler B; The output of described digital signal divider connects respectively the input of feedforward controller and the input of time-delay adjuster A, the output of described time-delay adjuster A is linking number weighted-voltage D/A converter B, frequency mixer B, power amplifier, coupler A successively, the input of described coupler A output difference butt coupling device B and the input of frequency mixer C, the output of described frequency mixer C connects the input of feedforward controller through analog to digital converter, the output of described feedforward controller is linking number weighted-voltage D/A converter A, frequency mixer A successively, the input of described frequency mixer A butt coupling device B.
7. described digitlization feed-forward amplifier according to claim 6, it is characterized in that described feedforward controller comprises digital gain adjusting device B, time-delay adjuster B, calculator, phase regulator, the digital gain adjusting device A that connects successively, described calculator input connects the output of digital signal divider, the output of described digital gain adjusting device B input connection mode number converter.
8. described digitlization feed-forward amplifier according to claim 7 is characterized in that described calculator comprises subtracter.
9. described digitlization feed-forward amplifier according to claim 8, it is characterized in that described calculator comprises variance calculator, described variance calculator is for the variance of the signal of the signal that calculates described direct input feedforward controller and time-delay adjuster B output, and judge that whether described variance is greater than preset value, if, forward delay interval is adjusted instruction, re-starts adjustment after time-delay adjuster A and time-delay adjuster B receive instruction.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023024090A1 (en) * | 2021-08-27 | 2023-03-02 | 华为技术有限公司 | Signal amplification circuit and method, and signal transmitter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1283326A (en) * | 1997-12-23 | 2001-02-07 | 摩托罗拉公司 | Feed forwark amplifier with digital intermodulation control |
| CN1374812A (en) * | 2001-03-14 | 2002-10-16 | 西门子公司 | Method and apparatus for transmitting signal digital predistortion, frequency characteristic compensation and feed forward linearization |
| EP1564910A2 (en) * | 2004-01-14 | 2005-08-17 | Hitachi Communication Technologies, Ltd. | Timing adjustment for wireless communication |
| CN202586878U (en) * | 2012-03-16 | 2012-12-05 | 京信通信系统（中国）有限公司 | Digital feed-forward amplifier |
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2012
- 2012-03-16 CN CN201210071672.2A patent/CN103312274B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1283326A (en) * | 1997-12-23 | 2001-02-07 | 摩托罗拉公司 | Feed forwark amplifier with digital intermodulation control |
| CN1374812A (en) * | 2001-03-14 | 2002-10-16 | 西门子公司 | Method and apparatus for transmitting signal digital predistortion, frequency characteristic compensation and feed forward linearization |
| EP1564910A2 (en) * | 2004-01-14 | 2005-08-17 | Hitachi Communication Technologies, Ltd. | Timing adjustment for wireless communication |
| CN202586878U (en) * | 2012-03-16 | 2012-12-05 | 京信通信系统（中国）有限公司 | Digital feed-forward amplifier |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023024090A1 (en) * | 2021-08-27 | 2023-03-02 | 华为技术有限公司 | Signal amplification circuit and method, and signal transmitter |
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Address after: 510663 Shenzhou Road 10, Science City, Guangdong, Guangzhou Patentee after: Jingxin Network System Co.,Ltd. Address before: 510663 Shenzhou Road 10, Science City, Guangdong, Guangzhou Patentee before: COMBA TELECOM SYSTEMS (CHINA) Ltd. |
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