CN106301251A - A kind of High Linear power amplifier structure based on feedback technique - Google Patents
A kind of High Linear power amplifier structure based on feedback technique Download PDFInfo
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- CN106301251A CN106301251A CN201610662312.8A CN201610662312A CN106301251A CN 106301251 A CN106301251 A CN 106301251A CN 201610662312 A CN201610662312 A CN 201610662312A CN 106301251 A CN106301251 A CN 106301251A
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- power amplifier
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- amplifier tube
- radio frequency
- 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
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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
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
-
- 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
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- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of High Linear power amplifier structure based on feedback technique, including envelope detector one, input matching network, main power amplifier tube and auxiliary power amplifier tube thereof, output matching network, attenuation network, envelope detector two and error amplifier, main power amplifier tube and auxiliary power amplifier tube thereof are for amplifying the power of radio frequency input, loss when input matching network and output matching network are for reducing power transmission, attenuation network exports for attenuating RF, envelope detector one is for detecting the envelope signal of radio frequency input, envelope detector two is the envelope signal of radio frequency output after detecting decay, error amplifier is amplified and feeds back to the grid of auxiliary power amplifier tube to the difference of two envelope signals.Compared to traditional multiple-gate transistor power amplifier structure, the gate bias of the auxiliary power amplifier tube of described High Linear power amplifier is adaptive, can realize the higher linearity in broader input reference signal.
Description
Technical field
The present invention relates to a kind of power amplifier structure, particularly relate to a kind of be applicable to transmitting set based on feedback
The High Linear power amplifier structure of technology.
Background technology
Transistor in power amplifier is operated in large-scale condition, and its nonlinear effect is the most aobvious compared with small-signal
Write；Simultaneously along with linear modulation mode and the extensive application of multi-transceiver technology of spectral efficient so that modulated signal power peak
All ratios are more and more higher, for the normal work of communication system in ensureing modulation fidelity and avoiding interference adjacent channel, to power
The linearity of amplifier is had higher requirement.
The power amplifier linearization technology of main flow has feedback, back-off, feedforward, predistortion, non-linear element at present
Linear amplification (LINC), envelope elimination and recovery (EER).Traditional feedback technique loop gain when high frequency is relatively low, with
Time there is serious stability problem, although can by the loop increase frequency changer circuit make feedback control loop be operated in low frequency,
But the control of now phase shift becomes difficult point, too increase the complexity of circuit simultaneously；Back-off technology is relatively simple and can
Lean on, but its power utilization is the lowest and linearity improvement is limited；The memory effect of power amplifier makes pre-distortion algorithms more
Complicated；Feedforward, LINC and EER technology circuit structure relative complex, and the coupling requirement to two paths of signals or amplitude and phase place
At a relatively high.
Traditional multiple-gate transistor power amplifier structure can only offset the AM-AM distortion that constant envelope signals produces, right
The linearity improvement of non-constant envelope signals is the most inconspicuous.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of height based on feedback technique
Linear power amplifier structure, feeds back to auxiliary power by the difference utilizing input envelope signal and output envelope signal and amplifies
The gate bias of pipe so that output signal envelope can follow input signal envelope, can compensate main power amplifier tube not simultaneously
The gain loss caused during with signal amplitude, reaches to improve the purpose of power amplifier linearity.
Technical scheme: for achieving the above object, the technical solution used in the present invention is:
A kind of High Linear power amplifier structure based on feedback technique, including envelope detector one, input matching network,
Main power amplifier tube and auxiliary power amplifier tube, output matching network, attenuation network, envelope detector two and error are amplified
Device, main power amplifier tube and auxiliary power amplifier tube thereof are used for amplifying the power of radio frequency input, input matching network and output
Loss when distribution network is for reducing power transmission, attenuation network exports for attenuating RF, and envelope detector one is used for detecting
The envelope signal of radio frequency input, envelope detector two is the envelope signal of radio frequency output, error amplifier pair after detecting decay
The difference of two envelope signals is amplified and feeds back to the grid of auxiliary power amplifier tube so that the envelope signal of radio frequency output
The envelope signal of radio frequency input can be followed, compensated the increasing of change of main power amplifier tube moment simultaneously by auxiliary power amplifier tube
Benefit loss.
Concrete, radio frequency input is concurrently accessed the input of envelope detector one and the input of input matching network, penetrates
Frequency output picks out from the outfan of output matching network；The outfan of input matching network is simultaneously connected with the defeated of main power amplifier tube
Entering the input of end and auxiliary power amplifier tube, the outfan of main power amplifier tube and the outfan of auxiliary power amplifier tube are simultaneously
Connecting the input of output matching network, the outfan of output matching network is simultaneously connected with the outfan of load and attenuation network,
The outfan of attenuation network connects the input of envelope detector two, and the outfan of envelope detector one connects error amplifier
Negative input end, the outfan of envelope detector two connects the positive input terminal of error amplifier, and the outfan of error amplifier connects
The grid of auxiliary power amplifier tube.
Concrete, it is contemplated that the power amplifier tube linearity and efficiency compromise, main power amplifier tube and auxiliary power are put
The selection of big pipe is taked specified below: described main power amplifier tube works in AB class, has gain compression characteristics；Described auxiliary merit
The gate bias of rate amplifier tube is controlled by the output signal of error amplifier, and general work, in deep B class or C class, has gain and expands
Exhibition characteristic, the gate bias of auxiliary power amplifier tube follow radio frequency input envelope signal and decay after radio frequency output envelope letter
Number change so that auxiliary power amplifier tube can compensate for the main power amplifier tube moment change gain loss.
Concrete, the attenuation of described attenuation network is the linear gain of main power amplifier tube, after attenuation network is decayed
The envelope signal of radio frequency output is input to error amplifier with the difference of the envelope signal of radio frequency input, amplifies through error amplifier
After difference feed back to the grid of auxiliary power amplifier tube so that the envelope signal of radio frequency output can follow the bag of radio frequency input
Network signal.
The High Linear power amplifier structure based on feedback technique that the present invention proposes, the input for non-constant-envelope is believed
For number, by the output envelope signal after detecting input respectively and decaying, and by anti-after its signal difference feeding error amplifier
It is fed to the grid of auxiliary power amplifier tube, controls the direct current biasing of auxiliary power amplifier tube with this so that output signal envelope
Input signal envelope can be followed, the gain loss that main power amplifier tube causes when unlike signal amplitude can be compensated simultaneously.This
Invention propose High Linear power amplifier structure based on feedback technique, can the main power amplifier tube of effective compensation in bigger input
A part of AM-AM distortion in range of signal, reaches to improve the purpose of overall power Amplifier linearity.
Beneficial effect: the High Linear power amplifier structure based on feedback technique that the present invention provides, with prior art phase
Ratio, has the advantage that 1, the present invention biases auxiliary merit by the difference utilizing input signal envelope and output signal envelope
Rate amplifier tube so that output signal envelope can follow input signal envelope, improves the stability of overall power amplifier simultaneously；
2, the present invention is based on feedback technique so that the gate bias voltage of auxiliary power amplifier tube is along with input and output signal envelope
Change and change, thus compensate the gain loss of change of main power amplifier tube moment, improve the linearity of overall power amplifier.
Accompanying drawing explanation
Fig. 1 is the structural representation of the High Linear power amplifier based on feedback technique of the present invention；
Fig. 2 is the simulation result comparison diagram of the present invention and output third order intermodulation point (OIP3) of traditional structure, abscissa table
Show that input power, vertical coordinate represent that OIP3, unit are dBm.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is further described.
A kind of High Linear power amplifier based on feedback technique, including envelope detector one, input matching network, main merit
Rate amplifier tube and auxiliary power amplifier tube, output matching network, attenuation network, envelope detector two and error amplifier, main
Power amplifier tube and auxiliary power amplifier tube thereof are for amplifying the power of radio frequency input, input matching network and output matching network
Loss during for reducing power transmission, attenuation network exports for attenuating RF, and it is defeated that envelope detector one is used for detecting radio frequency
The envelope signal entered, envelope detector two is the envelope signal of radio frequency output after detecting decay, and error amplifier is to two bags
The difference of network signal is amplified and feeds back to the grid of auxiliary power amplifier tube so that the envelope signal of radio frequency output can be with
The envelope signal of radio frequency input, compensates the gain damage of change of main power amplifier tube moment simultaneously by auxiliary power amplifier tube
Lose.
As it is shown in figure 1, radio frequency input is concurrently accessed the input of envelope detector one and the input of input matching network,
Radio frequency output picks out from the outfan of output matching network；The outfan of input matching network is simultaneously connected with main power amplifier tube
Input and the input of auxiliary power amplifier tube, the outfan of main power amplifier tube and the outfan of auxiliary power amplifier tube are same
Time connect the input of output matching network, the outfan of output matching network is simultaneously connected with load and the output of attenuation network
End, the outfan of attenuation network connects the input of envelope detector two, and the outfan of envelope detector one connects error and amplifies
The negative input end of device, the outfan of envelope detector two connects the positive input terminal of error amplifier, the outfan of error amplifier
Connect the grid of auxiliary power amplifier tube.
In general, it is contemplated that the power amplifier tube linearity and efficiency compromise, main power amplifier tube works in AB class, tool
There is gain compression characteristics, AM-AM distortion and AM-PM distortion can be produced；In order to eliminate these distortions, traditional method is that employing is many
Gate transistor structure, is the auxiliary power amplifier tube of a main power amplifier tube fixed bias in parallel, this fixed bias auxiliary
Help power amplifier tube general work in deep B class or C class, show gain extension characteristic, thus eliminate one to a certain extent
Divide AM-AM distortion, but this can only offset the amplitude distortion that constant envelope signals causes, for non-constant envelope signals, the party
Method is the highest to the improvement of the linearity.
The present invention is unlike traditional structure, and the gate bias voltage of auxiliary power amplifier tube is adaptive, by defeated
Enter signal and output signal together decides on so that output signal envelope can follow input signal envelope, main merit can be compensated simultaneously
The gain loss that rate amplifier tube causes when unlike signal amplitude.
In the case of being transistor size correspondence such as Fig. 2, the height based on feedback technique that the present invention that emulation obtains proposes
The output three of the multiple-gate transistor structure of the auxiliary power amplifier tube that linear power amplifier structure biases with traditional fixed railing
Rank intermodulation point (OIP3) are with the change curve of input signal power.From simulation result it can be seen that work as input signal power less
Time big, the OIP3 of the structure that the present invention proposes is significantly greater than the OIP3 of traditional structure.
In sum, the present invention is based on feedback technique, by utilizing the difference of input signal envelope and output signal envelope
Bias auxiliary power amplifier tube so that output signal envelope can follow input signal envelope, can compensate for main power simultaneously
The gain loss of amplifier tube moment change, greatly improves the linearity and the stability of overall power amplifier.
The above is only the preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (4)
1. a High Linear power amplifier structure based on feedback technique, it is characterised in that: include envelope detector one, input
Matching network, main power amplifier tube and auxiliary power amplifier tube thereof, output matching network, attenuation network, envelope detector two and
Error amplifier, main power amplifier tube and auxiliary power amplifier tube thereof are for amplifying the power of radio frequency input, input matching network
Loss during with output matching network for reducing power transmission, attenuation network exports for attenuating RF, envelope detector one
For detecting the envelope signal of radio frequency input, envelope detector two is the envelope signal of radio frequency output, error after detecting decay
Amplifier is amplified and feeds back to the grid of auxiliary power amplifier tube to the difference of two envelope signals so that radio frequency output
Envelope signal can follow the envelope signal of radio frequency input, compensates the main power amplifier tube moment by auxiliary power amplifier tube simultaneously
The gain loss of change..
High Linear power amplifier structure based on feedback technique the most according to claim 1, it is characterised in that: radio frequency is defeated
Entering to be concurrently accessed the input of envelope detector one and the input of input matching network, radio frequency exports from output matching network
Outfan picks out；The outfan of input matching network is simultaneously connected with the input of main power amplifier tube and auxiliary power amplifier tube
Input, the outfan of main power amplifier tube and the outfan of auxiliary power amplifier tube are simultaneously connected with the input of output matching network
End, the outfan of output matching network is simultaneously connected with the outfan of load and attenuation network, and the outfan of attenuation network connects bag
The input of network detector two, the outfan of envelope detector one connects the negative input end of error amplifier, envelope detector two
Outfan connect the positive input terminal of error amplifier, the outfan of error amplifier connects the grid of auxiliary power amplifier tube.
High Linear power amplifier structure based on feedback technique the most according to claim 1, it is characterised in that: described master
Power amplifier tube works in AB class, has gain compression characteristics；The gate bias of described auxiliary power amplifier tube is amplified by error
The output signal of device controls, and works in deep B class or C class, has gain extension characteristic, the gate bias of auxiliary power amplifier tube with
The envelope signal change of radio frequency output after the envelope signal of radio frequency input and decay, so that auxiliary power amplifier tube can
Compensate the gain loss of change of main power amplifier tube moment.
High Linear power amplifier structure based on feedback technique the most according to claim 1, it is characterised in that decline described in:
Subtract the linear gain that attenuation is main power amplifier tube of network, through attenuation network decay after radio frequency output envelope signal with penetrate
The difference of the envelope signal of frequency input is input to error amplifier, and the difference after error amplifier amplifies feeds back to auxiliary power
The grid of amplifier tube so that the envelope signal of radio frequency output can follow the envelope signal of radio frequency input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610662312.8A CN106301251A (en) | 2016-08-12 | 2016-08-12 | A kind of High Linear power amplifier structure based on feedback technique |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610662312.8A CN106301251A (en) | 2016-08-12 | 2016-08-12 | A kind of High Linear power amplifier structure based on feedback technique |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109167577A (en) * | 2018-08-30 | 2019-01-08 | 复旦大学 | Low-noise amplifier with envelope detected function |
| CN115291667A (en) * | 2021-12-22 | 2022-11-04 | 夏芯微电子(上海)有限公司 | Wireless communication device and adaptive bias voltage adjusting circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1518793A (en) * | 2001-04-23 | 2004-08-04 | ����ɭ�绰�ɷ�����˾ | Automatic optimization of linearity for envelope feedback amplifier linearization |
| CN1855698A (en) * | 2004-12-13 | 2006-11-01 | 株式会社东芝 | A doherty amplifier and signal processing method thereof |
-
2016
- 2016-08-12 CN CN201610662312.8A patent/CN106301251A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1518793A (en) * | 2001-04-23 | 2004-08-04 | ����ɭ�绰�ɷ�����˾ | Automatic optimization of linearity for envelope feedback amplifier linearization |
| CN1855698A (en) * | 2004-12-13 | 2006-11-01 | 株式会社东芝 | A doherty amplifier and signal processing method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109167577A (en) * | 2018-08-30 | 2019-01-08 | 复旦大学 | Low-noise amplifier with envelope detected function |
| CN109167577B (en) * | 2018-08-30 | 2022-04-12 | 复旦大学 | Low noise amplifier with envelope detection |
| CN115291667A (en) * | 2021-12-22 | 2022-11-04 | 夏芯微电子(上海)有限公司 | Wireless communication device and adaptive bias voltage adjusting circuit |
| CN115291667B (en) * | 2021-12-22 | 2023-08-25 | 夏芯微电子(上海)有限公司 | Wireless communication device and adaptive bias voltage adjustment circuit |
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Application publication date: 20170104 |
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