CN106849880A - Efficient linear digital radio frequency power signal generating method based on polar coordinates treatment - Google Patents

Efficient linear digital radio frequency power signal generating method based on polar coordinates treatment Download PDF

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Publication number
CN106849880A
CN106849880A CN201611248703.1A CN201611248703A CN106849880A CN 106849880 A CN106849880 A CN 106849880A CN 201611248703 A CN201611248703 A CN 201611248703A CN 106849880 A CN106849880 A CN 106849880A
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China
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signal
frequency power
level component
radio frequency
level
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CN201611248703.1A
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Inventor
杨成
韩鹏帅
文国军
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CETC 50 Research Institute
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CETC 50 Research Institute
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Priority to CN201611248703.1A priority Critical patent/CN106849880A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
    • H03F1/06—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers
    • H04B2001/045—Circuits with power amplifiers with means for improving efficiency

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Amplifiers (AREA)

Abstract

The invention discloses a kind of efficient linear digital radio frequency power signal generating method based on polar coordinates treatment, including：The orthogonal vector expression way of radiofrequency signal is converted into polar coordinate vectors expression way；Level component and phase component to polar coordinate vectors are respectively processed in numeric field, Automatic level control is carried out through the level component signal drive level component tracking Switching Power Supply after treatment, phase component is realized producing modulated CF signal through digital phase modulation and up-conversion；CF signal drives RF switch power circuit, the output level of the output voltage control radio-frequency power circuit of level component tracking Switching Power Supply after most being filtered through harmonic supression filter afterwards, to export the rf power signal for meeting and requiring through shaping pulse；The level component tracking power supply and radio-frequency power on-off circuit are with pulse switch operation.Technical scheme realizes the high efficiency of radio frequency linear power amplifying circuit.

Description

Efficient linear digital radio frequency power signal generating method based on polar coordinates treatment
Technical field
It is more particularly to a kind of to be sat based on pole the present invention relates to a kind of efficient linear digital radio frequency power signal generating method Mark the efficient linear digital radio frequency power signal generating method for the treatment of.
Background technology
Radio-frequency power amplifier (RFPA, radio frequency power amplifier) is radio communication equipment In topmost energy dissipation device and nonlinear device.Lifting efficiency of RF power amplifier is to realize wireless communication system reduction work( Most one of direct mode of consumption and reduction volume.However, generally efficient radio-frequency power amplifier is generally with stronger non- Linearly, the spectral leakage outside the distorted signals and signal bandwidth in signal bandwidth will be caused.
With the requirement more and more higher minimized to radio communication equipment, it is desirable to reduce the work(of radio-frequency power amplifier Consumption, improves the power-efficient of radio-frequency power amplifier.Therefore, the designing points of radio-frequency power amplifier are to ensure power efficiency While improve its linearity, signal distortion is reduced in tolerance interval.At present, conventional RF linear power amplification efficiency Only reach 30 or so percent.The efficiency of RF linear power amplifier is further improved, is urgently solved as current Wireless Telecom Equipment Problem certainly.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of efficient linear digital RF work(based on polar coordinates treatment Rate signal generating method, its can be by the digitlization of the level component of the polar coordinate vectors to radiofrequency signal and phase component at Reason, then synthesize driving RF power device, wireless communication RF linear power signal is produced, power amplification efficiency is improve, reach line Property degree requirement.
The present invention is to solve above-mentioned technical problem by following technical proposals：It is a kind of based on polar coordinates treatment it is efficient Linear digital rf power signal production method, it is characterised in that its efficient linear digital RF work(for being based on polar coordinates treatment Rate signal generating method is comprised the following steps：
Step one, polar coordinate vectors expression way is converted to by the orthogonal vector expression way of radiofrequency signal, produces level Component and phase component；
Step 2, Digital Signal Processing, level are carried out according to the level component and phase component to polar coordinate vectors respectively Component drive level component tracks Switching Power Supply, and phase component produces CF signal through up-conversion；
Step 3, the CF signal after phase-modulation drives RF switch power circuit, RF switch work(through shaping pulse The output level of rate circuit is tracked the output voltage control of Switching Power Supply by level component；
Step 4, after the output of RF switch power circuit is filtered through harmonic filter, output meets desired radio frequency work( Rate signal.
Preferably, the radiofrequency signal is modulated by the dsp chip of emitter and produced.
Preferably, the level component tracking Switching Power Supply and shaping pulse drives RF switch power circuit with pulse On off state works.
Positive effect of the invention is：
First, the present invention uses the polar coordinates expression way of radiofrequency signal, it is easy to the separating treatment of radiofrequency signal, accurately reflects The instantaneous phase and level of signal, it is adaptable to various complicated radiocommunication signals treatment；
2nd, the present invention is operated on off state using the power tube of digital RF power amplifier, and the utilization rate of power supply is especially high, work Making efficiency can reach 100% in theory.Real work efficiency up to more than 70%, compared with the efficiency of conventional RF power amplifier It is obviously improved；
3rd, the output level of digital RF Linear Power Amplifier circuit of the present invention is electric by the output of level component tracking Switching Power Supply Voltage-controlled system, level component tracking power supply realized using the on-off circuit of pulsewidth modulation, with efficiency high, the linearity be good, control is electric Flat wide ranges, fast response time, it is easy to which nonlinear compensation is carried out by digital form；
4th, circuit structure of the present invention is simple, it is easy to accomplish.
Brief description of the drawings
Fig. 1 is the flow chart of efficient linear digital radio frequency power signal generating method of the invention.
Fig. 2 is the schematic diagram of radiofrequency signal orthogonal vector expression way of the invention.
Fig. 3 is the schematic diagram of radiofrequency signal polar coordinate vectors expression way of the present invention.
Fig. 4 is that level component drive level component of the invention tracks Switching Power Supply, and phase component enters line phase to carrier frequency Modulation principle block diagram.
Fig. 5 is the principle of level component signal of the invention and the synthetically produced radio frequency linear power signal of phase component signal Block diagram.
Specific embodiment
Present pre-ferred embodiments are given below in conjunction with the accompanying drawings, to describe technical scheme in detail.
Sampling RF digitization treatment technology meets the various complicated applications demands of radio communication, the linear work(of digital RF Rate amplifying technique is a key technology therein.
Device miniaturization is realized, high-speed wideband radio applications is met, it is necessary to efficient linear power device.At present, By the variable-operation point technology and digital pre-distortion technology of RF power amplification, the power supply effect of radio-frequency power amplifier is improved Rate and linearity index.But it is not suitable for broadband operation, and signal transacting is complicated.
Digital power amplifier can meet power-efficient and linearity index in theory, and conventional method has：(1) pulse width Modulation (PWM)；(2) low pass increment summation modulation (∑ △ modulation).(such as audio frequency power amplifier), both modulation methods in low frequency applications Method is all feasible, but with the raising of frequency, when application extension is to radiofrequency signal, the realization of PWM just becomes more difficult, and ∑ △ is adjusted System also can be only applied to the low side of radio frequency band, be difficult to realize the digital RF power amplifier of more than 200MHz, because, both numerals Power amplifier is required for over-sampling rate higher to reduce the distortion in band.
As shown in figure 1, efficient linear digital radio frequency power signal generating method of the present invention based on polar coordinates treatment includes The following steps：
Step S1, I, Q orthogonal vector expression way of radiofrequency signal is converted to P, θ polar coordinates expression way, and wherein P is letter Number level component, θ for signal phase component；Radiofrequency signal by emitter DSP (Digital Signal Processing, Digital Signal Processing) chip modulation generation；
The orthogonal vector expression formula of radiofrequency signal is (1)：
Y (t)=I (t) cos ω t+Q (t) sin ω t (1)
The polar coordinate vectors expression formula of radiofrequency signal is (2)：
Y (t)=P (t) cos [ω t+ θ (t)] (2)
Wherein：
Step S2, the level component P according to signal, produce the pulse switch control letter of level component tracking Switching Power Supply Number, produce corresponding voltage output；The phase component of signal carries out phase-modulation to numerically-controlled oscillator (NCO), then through upper Frequency conversion produces emitter CF signal；
Step S3, the emitter CF signal after phase-modulation drives RF switch power circuit, radio frequency through shaping pulse The output level of switching power circuit is tracked the output voltage control of power supply by level component；
Step S4, after the digital radio frequency power signal after synthesis is filtered through harmonic supression filter, output meets what is required Efficient linear rf power signal.
Present invention uses sampling RF digitization treatment technology, the various complicated applications demands of radio communication are met, Digital RF linear prower amplifier technology is a key technology therein.
The level component tracking Switching Power Supply and shaping pulse drive RF switch power circuit with pulse switch shape State works, and so works more stable.
By adopting the above-described technical solution, compared with prior art, the beneficial effects of the invention are as follows：
First, the present invention uses the polar coordinates expression way of radiofrequency signal, it is easy to the separating treatment of radiofrequency signal, accurately reflects The instantaneous phase and level of signal, it is adaptable to various complicated radiocommunication signals treatment；
2nd, the present invention is operated on off state using the power tube of digital RF power amplifier, and the utilization rate of power supply is especially high, work Making efficiency can reach 100% in theory.Real work efficiency up to more than 70%, compared with the efficiency of conventional RF power amplifier It is obviously improved；
3rd, the output level of digital RF Linear Power Amplifier circuit of the present invention is electric by the output of level component tracking Switching Power Supply Voltage-controlled system, level component tracking power supply realized using the on-off circuit of pulsewidth modulation, with efficiency high, the linearity be good, control is electric Flat wide ranges, fast response time, it is easy to which nonlinear compensation is carried out by digital form；
4th, circuit structure of the present invention is simple, it is easy to accomplish.
Particular embodiments described above, technical problem, technical scheme and beneficial effect to solution of the invention are carried out Further describe, should be understood that and the foregoing is only specific embodiment of the invention, be not limited to The present invention, all any modification, equivalent substitution and improvements within the spirit and principles in the present invention, done etc., should be included in this Within the protection domain of invention.

Claims (3)

1. it is a kind of based on polar coordinates treatment efficient linear digital radio frequency power signal generating method, it is characterised in that it is based on The efficient linear digital radio frequency power signal generating method of polar coordinates treatment is comprised the following steps：
Step one, polar coordinate vectors expression way is converted to by the orthogonal vector expression way of radiofrequency signal, produces level component And phase component；
Step 2, Digital Signal Processing, level component are carried out according to the level component and phase component to polar coordinate vectors respectively Drive level component tracks Switching Power Supply, and phase component produces CF signal through up-conversion；
Step 3, the CF signal after phase-modulation drives RF switch power circuit, RF switch power electricity through shaping pulse The output level on road is tracked the output voltage control of Switching Power Supply by level component；
Step 4, after the output of RF switch power circuit is filtered through harmonic filter, output meets desired radio-frequency power letter Number.
2. as claimed in claim 1 to be based on the efficient linear digital radio frequency power signal generating method that polar coordinates are processed, it is special Levy and be, the radiofrequency signal is modulated by the dsp chip of emitter and produced.
3. as claimed in claim 1 to be based on the efficient linear digital radio frequency power signal generating method that polar coordinates are processed, it is special Levy and be, the level component tracking Switching Power Supply and shaping pulse drive RF switch power circuit with pulse switch state Work.
CN201611248703.1A 2016-12-29 2016-12-29 Efficient linear digital radio frequency power signal generating method based on polar coordinates treatment Pending CN106849880A (en)

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Application Number Priority Date Filing Date Title
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101136641A (en) * 2006-07-21 2008-03-05 联发科技股份有限公司 Multilevel transmitter to reach linear amplification with nonlinear components
CN101998028A (en) * 2009-08-13 2011-03-30 承景科技股份有限公司 Carrier wave tracking system and method
CN102291154A (en) * 2011-09-23 2011-12-21 电子科技大学 Polar coordinate transmitter
CN203014828U (en) * 2013-01-08 2013-06-19 深圳清华大学研究院 Digital rectification apparatus for radiofrequency signal
CN103560758A (en) * 2013-11-15 2014-02-05 上海无线电设备研究所 Power amplifier used for polar coordinate transmitter
CN105743453A (en) * 2016-02-02 2016-07-06 无锡中感微电子股份有限公司 SD modulation module based polar coordinate transmitter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101136641A (en) * 2006-07-21 2008-03-05 联发科技股份有限公司 Multilevel transmitter to reach linear amplification with nonlinear components
CN101998028A (en) * 2009-08-13 2011-03-30 承景科技股份有限公司 Carrier wave tracking system and method
CN102291154A (en) * 2011-09-23 2011-12-21 电子科技大学 Polar coordinate transmitter
CN203014828U (en) * 2013-01-08 2013-06-19 深圳清华大学研究院 Digital rectification apparatus for radiofrequency signal
CN103560758A (en) * 2013-11-15 2014-02-05 上海无线电设备研究所 Power amplifier used for polar coordinate transmitter
CN105743453A (en) * 2016-02-02 2016-07-06 无锡中感微电子股份有限公司 SD modulation module based polar coordinate transmitter

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Application publication date: 20170613

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