CN106208986A - A kind of design method based on digital feed forward technology Yu the digitized power amplifier of envelop following technology - Google Patents
A kind of design method based on digital feed forward technology Yu the digitized power amplifier of envelop following technology Download PDFInfo
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- CN106208986A CN106208986A CN201610768106.5A CN201610768106A CN106208986A CN 106208986 A CN106208986 A CN 106208986A CN 201610768106 A CN201610768106 A CN 201610768106A CN 106208986 A CN106208986 A CN 106208986A
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- digital
- power amplifier
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- feed forward
- envelope
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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
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3223—Modifications of amplifiers to reduce non-linear distortion using feed-forward
- H03F1/3229—Modifications of amplifiers to reduce non-linear distortion using feed-forward using a loop for error extraction and another loop for error subtraction
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/195—High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/213—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only in integrated circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
Abstract
The present invention provides a kind of design method based on digital feed forward technology Yu the digital power amplifier of envelop following technology.By digital feed forward technology, envelop following technology applies simultaneously in Designing power amplifier, can significantly the output linearity performance of hoisting power amplifier and conversion efficiency performance, overcome the problem that the problem of the non-linear difference of power amplifier is low with conversion efficiency simultaneously.The present invention is be applicable to the system of all of wireless communication power amplifier designs.
Description
Technical field:
The present invention relates to wireless communication technology field, be to utilize digital feed forward technology and envelop following technology to realize digital power to put
A kind of design method of big device design.It is low with conversion efficiency that the method can well solve the poorest of power amplifier
Problem.
Technical background
There is nonlinear problem and inefficient problem in power amplifier.
There is serious nonlinear problem in power amplifier itself, when power amplifier is in full power output, and power is put
Big device output signal is nonlinear, and power is the highest, and Signal Compression is the most serious, owing to the inter-modulated signal of non-linear generation makes adjacent
Frequency range is by serious interference.Digital feed forward technology can well solve non-linearity of power amplifier problem.Digital feed forward technology
Utilize contrary nonlinear properties, offset the nonlinear properties that power amplifier produces, but apply the power amplification of feed-forward technique
Device can cause the conversion efficiency of power amplifier to reduce problem.
It is low to there is conversion efficiency in power amplifier, serious problem of generating heat.Envelop following technology utilizes and changes power amplification
The supply voltage of device, makes power amplifier always work between high efficient area, improves the overall transformation efficiency of power amplifier,
Efficiency power amplifier problem is made to be addressed.But the power amplifier applying envelop following technology can cause non-linear asking
Inscribe more serious.
In order to solve nonlinear problem and the low problem of conversion efficiency of power amplifier simultaneously, use digitized power amplification
Device method for designing, applies digital feed forward technology and envelop following technology simultaneously, and two that solve power amplifier scarce simultaneously
Fall into.Designing High Linear, what conversion efficiency was high can the digital power amplifier of self-adaptative adjustment parameter.
Summary of the invention
The invention provides a kind of system based on digital feed forward technology Yu the digital power amplifier of envelop following technology
Method for designing, solves the problem that the non-linear and conversion efficiency of existence of wireless communication power amplifier is low.
Signal processing flow involved in the present invention is divided into digital power amplifier signal processing, at envelope-tracking signal
Reason, digital feedforward signal process, and will describe one by one below.
Digital power amplifier signal processing flow: digital baseband signal is processed through Digital Up Convert, then through penetrating
Channel transmitter, output radiofrequency signal amplifies output to digital power amplifier.Digital power amplifier provide feedback signal to
Envelope-tracking processes and processes with digital feed forward, also provides for using the final rate amplifier output signal after directional coupler to number
Word feedforward carries out signal processing.
Envelope-tracking signal processing method flow process:
Extract the energy envelope information of baseband signal, for controlling the supply voltage of digital power amplifier, make supply voltage
Change consistent with the change of the energy envelope of baseband signal.
Carry out Digital Signal Processing by the feedback signal of digital power amplifier, supply voltage with baseband signal, extract
Amplitude, time delay and phase information, synchronize envelope signal and compensation deals.
Use the feedback voltage of variable voltage DC source array, extract the change information of voltage, amplify with digital power
The amplitude of the output signal of device contrasts, and forms closed loop link, adjusts the Delay of output envelope signal, makes digital power
The supply voltage of amplifier is consistent with output signal envelope.
Baseband envelope extracting method: calculate the energy value of base band I/Q signal, makes statistics to energy frequency distribution, extracts
The signal of the low frequency of energy, reverts to envelope signal.
The processing method of variable voltage: the standalone module of array signal is carried out on-off control, simultaneously to each module
Voltage feedback signal is controlled, it is achieved the change to output voltage controls.
Digital feed forward process flow:
The feedback signal of radio-frequency power amplifier is input to feed back to digital feed forward and processes, and processes for digital feed forward data.
The radiofrequency signal that the feedback signal of radio-frequency power amplifier exports with digital feed forward merges, and merges signal and extracts exactly
Nonlinear properties, non-linear model need to feed back to digital feed forward module and carry out signal processing, forms first closed loop, and self adaptation is adjusted
Whole, for accurately extracting the nonlinear properties of power amplifier.
The nonlinear properties that digital feed forward extracts, through amplitude, phase place and the adjustment of time delay, are put through feed-forward power
Big device amplifies, and merges with digital power amplifier in directional coupler, offsets the nonlinear properties of power amplifier, offsets it
After signal feed back to digital feed forward and baseband signal and again carry out signal processing, form second closed loop, adaptive adjustment
Amplitude, phase place and time delay, it is achieved the adaptive cancellation of precision.
Envelope-tracking and the signal processing of digital feed forward, need linkage to carry out, and two algorithms need to carry out coordinating to adjust.
Accompanying drawing explanation
Fig. 1: a kind of system design side based on digital feed forward technology Yu the digitized power amplifier of envelop following technology
Method theory diagram.
Fig. 2: envelope-tracking variable voltage DC source array structure schematic diagram.
Fig. 3: envelope-tracking signal processing flow figure.
The digital power amplifier variable voltage of Fig. 4: envelope-tracking is powered (401) and digital power amplifier output signal
(402) graph of a relation.
Fig. 5: digital feed forward power amplifier realizes structural representation
Fig. 6: raw baseband signal signal spectrum figure
Fig. 7: digital power amplifier output signal spectrum figure
The nonlinear properties spectrogram that Fig. 8: digital feed forward is extracted
Fig. 9: the signal spectrum figure after digital feed forward carries out nonlinear properties counteracting.
Detailed description of the invention
In order to make the implementation method of the present invention, realize feature and advantage describes clear, below in conjunction with reference to accompanying drawing to this
Embodiment and the implementation result of invention are described in detail.
System based on digital feed forward technology and the digitized power amplifier of envelop following technology is as it is shown in figure 1, by counting
Word feedforward part and envelope-tracking part composition, two parts need to cooperate linkage, make up each other.
As it is shown in figure 1, digital baseband data 117 part, it it is baseband digital I/Q signal.
Before digital baseband data 117 parts connect envelope-tracking controller 101, Digital Signal Processing 103 and numeral respectively
Feedback processes 105.
Envelope-tracking processes 101 modules, describes in detail and sees Fig. 3.
As it is shown on figure 3, first envelope-tracking handling process is by the energy balane 302 of baseband signal, then carry out energy
Amount envelope extraction 303, it is achieved method is the Power Spectrum Distribution according to energy, counts power spectrum distributed data, then carries out energy
The high-frequency signal of amount signal filters 304, extracts the Control of Voltage letter of applicable variable voltage DC source array (shown in Fig. 2)
Number, envelope signal needs to carry out delay process 305, enters with feedback signal, the voltage feedback signal of digital power amplifier output
Row signal analysis and processing, delay parameter is synchronized computing module 306 by time delay to be provided, and envelope control signal directly controls variable voltage
DC source array so that it is exporting envelope power supply for digital power amplifier, Delay Synchronization computing module 306 uses digital power
The feedback signal of amplifier output, supply voltage carry out synchronize and parameter calculating with baseband signal.
Fig. 2 is variable voltage DC source array, and the change of voltage has two aspects to control simultaneously, and first is directly to open
Or any one DC power supplier in the closed array of pass, second is the feedback voltage to each independent DC power supplier
It is controlled, the energy envelope that the envelope making power array export exports closest to preferable digital power amplifier.
The energy of output envelope and the signal of power supply closer to, then the efficiency of digital power amplifier is the highest, can make power
The efficiency of amplifier rises to 50% or higher from 15%.
As shown in Figure 4, wherein 401 is unidirectional current to the relation of variable voltage DC source array output voltage and signal envelope
Source voltage envelope, the signal that 402 is digital power amplifier output.
102 signals in Fig. 1 are through Digital Signal Processing calculated envelope control parameter in 103.
In Fig. 1 106 are envelope information, for controlling the change in voltage of variable voltage DC source array.
In Fig. 1 107 are the feedback informations of variable voltage DC source array output voltage, need to feed back to 103 modules,
For judging the error between voltage and digital power amplifier 111, including delay time error and gain error.
103 modules in Fig. 1, it is achieved envelope-tracking and the algorithm of digital feed forward, the wherein time-delay calculation of envelope-tracking, increasing
The gain error of benefit Error Calculation and forward link compensates, and the gain error that envelope-tracking brings can affect EVM, needs
103 modules are modified, and 103 modules need to realize launching signal lags and adjust, for realizing envelope-tracking and digital feed forward
Associating delay process.
108 signals of Fig. 1, baseband signal is through signal condition, and including filtering, the gain error of envelope-tracking compensates, number
Word up-conversion, in the radiofrequency signal exported through radio frequency sending set, is the input signal of 111 digital power amplifiers, signal frequency
Spectrogram sees Fig. 6.
In Fig. 1 114 are the output signal of digital power amplifier 111, and signal spectrum figure sees Fig. 7, permissible from figure
Find out 111 non-linear.
The 103 of Fig. 1 also achieve the signal processing of digital feed forward, use the feedback of baseband signal and digital power amplifier
Gain, phase place, time delay, group delay and the inband flatness parameter that signal 109 calculates, it is provided that at parameter 104 to digital feed forward
Reason 105, digital feed forward processes 105 and is adjusted the radiofrequency signal of output at numeric field, it is achieved when gain, phase place, time delay, group
Prolong the compensation with inband flatness.Nonlinear properties are gone out with 109 united extraction of the feedback signal of digital power amplifier, and right
Nonlinear properties carry out the adjustment of gain, phase place, time delay, form the output signal 113 of 105, the frequency spectrum of nonlinear properties 113
Figure is as shown in Figure 8.
112 couple of Fig. 1 113 signal carries out power amplification, with the nonlinear properties of digital power amplifier 111 in energy phase
With, time delay is identical, opposite in phase, output signal 114 and the digital feed forward of digital power amplifier extract non-linear 116
Use directional coupler 115 to realize signal and close road, it is achieved the elimination of nonlinear properties, spectrogram characteristic such as Fig. 9 of output signal
Shown in.
The feedback signal 118 of the directional coupler 115 of Fig. 1 feeds back to 105, forms closed loop, it is achieved close neutralization effect
Ring is monitored, it is achieved self-adaptative adjustment offsets parameter.
The detailed process of digital feed forward is as it is shown in figure 5, baseband signal is divided into three tunnels, and a road, to radio frequency sending set 501, converts
For radiofrequency signal, as the input signal of digital power amplifier, the signal of digital power amplifier is input to directional coupler,
The output signal of digital power amplifier feeds back to 504 conjunction roads, forms first closed loop, and directional coupler signal feeds back to 506
Form second closed loop.
Baseband signal in Fig. 5 carries out amplitude through 502, and phase place adjusts with time delay, through transmitter 503, is input to close
Road device 504, goes out nonlinear properties 510 with digital power amplifier feedback signal united extraction, and nonlinear properties 510 need feedback
To 506, form first closed loop, be input simultaneously to 505 and carry out amplitude, phase place and the adjustment of time delay, putting through feed-forward power
Big device amplifies, and is input to directional coupler and merges, and offsets nonlinear properties, and offset result feeds back to 506, forms second
Closed loop control, it is achieved amplitude, phase place, the synchronization of delay parameter calculate, parameter adjustment 505 module calculated.
Claims (13)
1. a design method based on digital feed forward technology Yu the digitized power amplifier of envelop following technology, its bag
Include:
Apply the digital power amplifier design method of digital feed forward technology and envelop following technology simultaneously；
Digital feed forward compensation link, exports the nonlinear properties anti-phase with digital power amplifier, compensates digital power amplifier
Nonlinear characteristic；
Envelope-tracking link, changes, according to digital power amplifier output signal energy envelope, electricity of powering digital power amplifier
Pressure is controlled；
Digital feed forward technology and envelop following technology need to work in coordination linkage.
System the most according to claim 1, including directional coupler, it is achieved digital feed forward nonlinear properties and power amplification
The merging of device signal, directional coupler can use passive cavity filter to realize closing road, and can be to use radio frequency microstrip line mode
Realize.
The most according to claim 1, system, digital feed forward technology is according to digital baseband signal and digital power amplifier
Nonlinear feedback signal, forms first closed loop, by correlation computations range error, phase error, time-delay deviation parameter, uses
Baseband signal and feedback signal, extract nonlinear properties, and utilize nonlinear properties to merge with power amplifier output signal
Afterwards, feed back to digital feed forward and carry out the parameter calculating of the amplitude of nonlinear properties, phase place, time delay, form second closed loop, logical
The time delay of the nonlinear properties repaid, amplitude, phase parameter are reorganized and brought up in toning to full strength, reach to eliminate the nonlinear properties of power amplifier.
Digital feed forward system the most according to claim 3, the amplitude of two closed loops of digital feed forward, phase place, delay parameter meter
Calculate, all use digital signal to be calculated.
The most according to claim 3, digital feed forward system, digital feed forward includes feed forward compensated power amplifier, to feedforward compensation
Signal carries out power amplification, is amplified to consistent with the nonlinear properties power of digital power amplifier.
The most according to claim 3, in digital feed forward technology, signal amplitude error, the phase error of first closed loop and prolong
Time error parameter adjustment, all realizes at numeric field.
The most according to claim 1, digital power amplifier feedback signal, it is divided into two-way, wherein a road is used for digital feed forward
Part, extracts nonlinear properties；An other road signal is used for envelope-tracking part, extracts the bag of power amplifier output signal
Network information.
The most according to claim 1, envelope-tracking includes variable voltage DC source array module, according to baseband signal envelope
With digital power amplifier output signal envelope, provide variable voltage power supply for digital power amplifier.
The most according to claim 8, the change in voltage control method of variable voltage DC source, including directly control each directly
The feed back input voltage of stream power module is real with the Partial DC power module optionally opening and closing power module array
Existing.
The most according to claim 1, envelope-tracking extracts the envelope information of baseband signal, according to digital power amplifier
Feedback signal and the information of voltage of variable voltage power array, calculate control information, dynamically adjusts variable voltage DC source
The voltage of output.
11. according to claim 1, in envelop following technology, and signal energy envelope extraction, signal energy Spectral structure need to be used
Mode, uses the mode of wave filter to extract energy low frequency signal.
12. according to claim 1, can use one or more power tube, can support various inside digital power amplifier
Designing power amplifier structure, uses digitized voltage to direct current biasing parameter, and cooperated power supply voltage realizes dynamically controlling.
13. according to claim 1, and the input signal of digital power amplifier supports radiofrequency signal input, supports fiber count
Word signal inputs, and supports digital baseband signal input.
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| CN110537328A (en) * | 2017-03-30 | 2019-12-03 | 英特尔Ip公司 | Feedover envelope-tracking |
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