CN207070019U - Analog predistortion power amplifier linearity circuit for rectifying and system - Google Patents
Analog predistortion power amplifier linearity circuit for rectifying and system Download PDFInfo
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- CN207070019U CN207070019U CN201721018939.6U CN201721018939U CN207070019U CN 207070019 U CN207070019 U CN 207070019U CN 201721018939 U CN201721018939 U CN 201721018939U CN 207070019 U CN207070019 U CN 207070019U
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Abstract
It the utility model is related to analog predistortion power amplifier linearity circuit for rectifying and system.The circuit includes：Including the first variable power amplifier, the first non-linear distortion unit, the second non-linear distortion unit, the 3rd non-linear distortion unit and the second variable power amplifier；The signal output part of first variable power amplifier connects the signal input part of the first non-linear distortion unit, the signal input part of the second non-linear distortion unit respectively, the signal output part of second non-linear distortion unit connects the signal input part of the 3rd non-linear distortion unit, the signal input part of the second variable power amplifier respectively, and the output end of the first non-linear distortion unit, the signal output part of the 3rd non-linear distortion unit are all connected to ground；The first non-linear distortion unit, the second non-linear distortion unit, the 3rd non-linear distortion unit form a non-linear predistortion device.It can ensure that radio-frequency power amplifier keeps optimum Working under various operating conditions by circuit of the present utility model.
Description
Technical field
Electronic circuit technology field is the utility model is related to, is corrected more particularly to analog predistortion power amplifier linearity
Circuit and system.
Background technology
Third order intermodulation is the index for weighing linearity of radio-frequency power amplifier, is input power amplifier two briefly
Individual frequency component f1 and f2, output will include two frequency components f1 and f2, and thirdly rank intermodulation component 2*f1-f2 and 2*
F2-f1, intermodulation component is smaller, linearly better.
The linearization performance of radio-frequency power amplifier is subjected to variation of ambient temperature, service voltage fluctuation, device aging, device
The influence of the factors such as part uniformity difference, cause the amplitude of third order intermodulation component and phase meeting caused by radio-frequency power amplifier itself
Change therewith, particularly the influence of environment temperature, however, existing circuit for rectifying is but difficult to ensure that radio-frequency power amplifier complete
Optimum Working is maintained in temperature range for a long time.
Utility model content
Based on this, the utility model provides analog predistortion power amplifier linearity circuit for rectifying and system.This practicality
New Scheme includes：
A kind of analog predistortion power amplifier linearity circuit for rectifying, including：It is first variable power amplifier, first non-thread
Property distortion unit, the second non-linear distortion unit, the 3rd non-linear distortion unit and the second variable power amplifier；Described
The signal input part connection signal input interface of one variable power amplifier, the signal output of first variable power amplifier
End connects signal input part, the signal input part of the second non-linear distortion unit of the first non-linear distortion unit respectively,
The signal output part of second non-linear distortion unit connects the signal input part of the 3rd non-linear distortion unit, second variable respectively
The signal input part of power amplifier, the output end of the first non-linear distortion unit, the signal of the 3rd non-linear distortion unit are defeated
Go out end and be all connected to ground, the signal output part of second variable power amplifier is as signal output interface, for connection pair
The radio-frequency power amplifier answered；
The first non-linear distortion unit, the second non-linear distortion unit, the 3rd non-linear distortion unit composition one are non-
Linear predistorter, the first non-linear distortion unit, the 3rd non-linear distortion unit are used to the compensation of radio frequency link signal gain,
Second non-linear distortion unit is used for the phase compensation of radio frequency link signal.
A kind of analog predistortion power amplifier linearity correction system, including radio-frequency power amplifier and mould described above
Intend the linear circuit for rectifying of pre-distorting power amplifier, the signal output of the analog predistortion power amplifier linearity circuit for rectifying
Interface connects the signal input part of the radio-frequency power amplifier.
Above-mentioned technical proposal, the first non-linear distortion unit, the second non-linear distortion unit, the 3rd non-linear distortion unit
The non-linear predistortion device of a Pi type structures is formed, radiofrequency signal inputs from the first variable gain amplifier, successively by Pi types
Exported after the non-linear predistortion device and the second variable power amplifier of structure to corresponding radio-frequency power amplifier, the simulation
The linear circuit for rectifying of pre-distorting power amplifier can radio-frequency power amplifier corresponding to real time dynamic optimization distortion, make corresponding penetrate
The counteracting that the third order intermodulation component of frequency power amplifier output is maximized, so as to maintain power amplifier high linearity to export, that is, passes through
Analog predistortion power amplifier linearity circuit for rectifying of the present utility model, it can effectively ensure that radio-frequency power amplifier in full temperature
Optimum Working is maintained in the range of degree for a long time.
Brief description of the drawings
Fig. 1 is the structure chart of the analog predistortion power amplifier linearity circuit for rectifying of an embodiment；
Fig. 2 is the structure chart of the analog predistortion power amplifier linearity circuit for rectifying of another embodiment；
Fig. 3 is the structure chart of the analog predistortion power amplifier linearity correction system of an embodiment.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
In order to more effectively utilize limited frequency spectrum resource, it is higher that many wireless communication systems all employ the availability of frequency spectrum
8PSK, 16QAM even high-order modulatings such as 64QAM realize higher message transmission rate, and this is to frequency microwave power
Amplifier proposes tightened up power output and linearity, exacerbate frequency microwave power amplifier ' linear ' and
The contradiction of institute's generally existing between ' efficiency '.Because efficiency is higher when closer to saturation output power, but closer
Saturation output power, it is linearly poorer.Traditional method have to allow power amplifier to be operated in from saturation output work to keep linear
The many states of rate rollback, cause efficiency of amplitude very poor.
High linearity refers to that signal is undistorted by amplifier amplitude and phase, particularly without new caused frequency point
Amount output.The method for realizing high linearity power amplifier is a lot, mainly have Power back, feedback technique, feed-forward technique and
Pre-distortion technology etc..The shortcomings of efficiency is low, cost is high be present in Power back.Feedback transmitter stability is poor.Feed forward approach is due to requiring
Extra error amplifier and complicated control circuit, cause costly and power amplification efficiency relatively low, while also need to many outer
Component is enclosed, the volume of power amplifier is general also bigger.Pre-distortion method includes radio frequency distortion and Digital base-band pre-distortion
Etc. the various type of skills.Radio frequency distortion method have the advantages that circuit is simple, cost is low, efficiency high, small volume, broadband, in state
It is widely applied in inside and outside frequency microwave communication system.
Fig. 1 is the schematic diagram of the analog predistortion power amplifier linearity circuit for rectifying of an embodiment, with reference to figure 1
Shown, the analog predistortion power amplifier linearity circuit for rectifying includes：First variable power amplifier U1, first is non-linear
Distortion unit U2, the second non-linear distortion unit U3, the 3rd non-linear distortion unit U4 and the second variable power amplifier U5,
Radio-frequency power amplifier U6 corresponding to the signal output part connection of the second variable power amplifier U5.The first variable work(
Rate amplifier U1 signal input part connection signal input interface, the signal output part point of the first variable power amplifier U1
Signal input part, the second non-linear distortion unit U3 signal input part of the first non-linear distortion unit U2 is not connected,
Second non-linear distortion unit U3 signal output part connects the 3rd non-linear distortion unit U4 signal input part, second respectively
Variable power amplifier U5 signal input part, the first non-linear distortion unit U2 output end, the 3rd non-linear distortion unit
U4 signal output part is all connected to ground；The signal output part of the second variable power amplifier U5 connects as signal output
Mouthful, for connecting corresponding radio-frequency power amplifier U6.
The first non-linear distortion unit U2, the second non-linear distortion unit U3, the 3rd non-linear distortion unit U4 structures
Into a non-linear predistortion device, wherein, the first non-linear distortion unit U2, the 3rd non-linear distortion unit U4 are used to rf chain
Road signal gain compensation, the second non-linear distortion unit U3 are used for the phase compensation of radio frequency link signal.
Radiofrequency signal inputs from the first variable gain amplifier U1, successively can by the non-linear predistortion device and second
Variable power amplifier U5, predistortion component caused by the non-linearization distorter eventually enter into U6 after U5 adjusts intensity.
Pass through the producible third order intermodulation predistortion component of the non-linear predistortion device and the radio-frequency power amplifier
Third order intermodulation distortion component amplitude equal phase is opposite caused by U6.Linearly corrected using radio frequency analog pre-distorting power amplifier
Circuit is the third order intermodulation signal exported in advance by non-linearization predistorter, through work(come the technical principle linearized
After rate amplifier amplification, the third order intermodulation component amplitude equal phase of its amplitude and radio-frequency power amplifier itself output on the contrary,
For offsetting the third order intermodulation component of radio-frequency power amplifier itself, so as to reach the purpose of linearisation.
The analog predistortion power amplifier linearity circuit for rectifying of above-described embodiment, by controlling U1 gain and then controllable
System enters the signal power for the non-linearization distorter that U2, U3, U4 are formed, to reach the requirement of its signal input power.And U2,
The Pi types structure of U3, U4 composition also effectively overcomes the resistance matching problem in circuit under device dynamic working condition.Pass through
Control third order intermodulation predistortion component and third order intermodulation distortion component amplitude equal phase phase caused by U6 caused by U2, U3, U4
Instead, it may be such that the third order intermodulation component of U6 final outputs is minimum, so as to obtain optimal linearisation effect, wherein U2, U4 is main
The amplitude predistortion of radio frequency link signal is completed, supplemented by phase predistortion, the phase that U3 mainly completes radio frequency link signal is lost in advance
Very.
By the analog predistortion power amplifier linearity circuit for rectifying of above-described embodiment, due to first variable power
Amplifier U1, the second variable power amplifier U5 control voltage is adjustable, that is, enters by the first non-linear distortion unit U2, the
The signal power for the non-linear predistortion device that two non-linear distortion unit U3, the 3rd non-linear distortion unit U4 are formed is adjustable, because
This can real time dynamic optimization radio-frequency power amplifier U6 distortion, ensure analog predistortion power amplifier linearity correction system exist
Optimum Working is kept under various conditions of work for a long time.
In one embodiment, with reference to shown in figure 2, the analog predistortion power amplifier linearity circuit for rectifying also includes
MCU and temperature sensor U8.The temperature sensor U8 connections MCU, the MCU are also respectively connected with the first variable power and put
Big device U1 control terminal, the second variable power amplifier U5 control terminal, the MCU are also respectively connected with the first non-linear distortion list
First U2, the second non-linear distortion unit U3, the 3rd non-linear distortion unit U4.
Radio-frequency power amplifier U6 operating ambient temperature is detected by temperature sensor U8 and is transferred to MCU, MCU can base
The first variable power amplifier U1, the second variable power amplifier U5 gain are can adjust in ambient temperature situations, while can also
First non-linear mistake is adjusted according to the third order intermodulation component of ambient temperature situations and the radio-frequency power amplifier U6 reality outputs
True unit U2, the second non-linear distortion unit U3, the 3rd non-linear distortion unit U4 corresponding parameter so that radio-frequency power amplifies
What the third order intermodulation component of device U6 outputs was maximized balances out, and thus solves bringing for radio-frequency power amplifier U6 uniformity difference
Productibility problem, be advantageous to radio-frequency power amplifier U6 (change of such as environment temperature, supply electricity under various operating conditions
The fluctuation of pressure, the aging of device) it can obtain optimal linearisation effect, i.e., described analog predistortion power amplifier linearity
Circuit for rectifying long-term work is in optimum state.
In one embodiment, with continued reference to shown in Fig. 2, wherein, the first non-linear distortion unit U2 and the 3rd non-linear mistake
True unit U4 circuit structure is identical, includes：First nonlinear component device 1, biasing circuit, the first matching circuit for rectifying are (i.e.
Match circuit for rectifying 1).One end of the biasing circuit connects the MCU, the biasing circuit and other end connection described the
One end of one nonlinear component device (i.e. nonlinear component device 1), the other end of the first nonlinear component device pass through described
One matching circuit for rectifying is connected to ground.
Second non-linear distortion unit U3 includes：Second nonlinear component device (i.e. nonlinear component device 2) and the second matching
Circuit for rectifying (matches circuit for rectifying 2)；The second nonlinear component device passes through described in the second matching circuit for rectifying connection
MCU.One end of the first nonlinear component device in the first non-linear distortion unit also passes through second nonlinear component
Device connects one end of the first nonlinear component device in the second non-linear distortion unit.
Rf chain is mainly realized by the first non-linear distortion unit U2, the 3rd non-linear distortion unit U4 shown in Fig. 2
The gain compensation of road signal；The phase of radio frequency link signal is mainly realized by the second non-linear distortion unit U3 shown in Fig. 2
Compensation.The MCU can also be according to the work feelings of the ambient temperature situations residing for current radio frequency power amplifier U6, and U1, U5
Condition, the bias voltage size of two nonlinear component devices is adjusted by biasing circuit, to effectively improve non-linear predistortion
Matching problem.
For the device that radio-frequency power amplifier U6 uniformity is poor, by MCU adjust biasing circuit in U2, U4 and
With circuit for rectifying, and it is adjusted into the signal intensity of non-linearization predistorter and can changes the non-linearization predistorter
The size and phase of third order intermodulation component caused by advance, adapt it to the ratio of corresponding radio-frequency power amplifier output in production
More discrete third order intermodulation component offsets, and improves the productibility of system.
In another embodiment, biasing circuit is may also include in the second non-linear distortion unit U3, by described inclined
Circuits adjust the bias voltage of the second nonlinear component device, with the phase compensation situation to radio frequency link signal.I.e. in reality
Radio-frequency power amplifier U6 by variation of ambient temperature when, such as high/low temperature situation, radio-frequency power can be obtained in real time by U8 and put
Environment temperature residing for big device U6, and the temperature of acquisition is sent into MCU, MCU can adjust U1 control voltage in real time so that enter
The change in signal strength of non-linear predistortion device, and the bias voltage of three nonlinear component devices is adjusted in real time so that it is described non-
Predistortion third order intermodulation signal caused by linear predistorter keeps the third order intermodulation with radio-frequency power amplifier U6 itself outputs
The strict amplitude equal phase of signal is on the contrary, also the second variable power amplifier U5 of adjustment gain in real time simultaneously so that link
Reach gain to keep being basically unchanged the output optiamal linearization effect with radio-frequency power amplifier U6.
In one embodiment, the first nonlinear component device, the second nonlinear component device are with nonlinear characteristic
The Schottky diode for producing third order intermodulation component.
Pass through the analog predistortion power amplifier linearity circuit for rectifying of above-described embodiment so that the radio frequency in physical link
Power amplifier under various operating conditions can by (change of such as environment temperature, the fluctuation of service voltage, the aging of device)
Obtain optimal linearisation effect；The productibility brought for solving radio-frequency power amplifier device uniformity difference in link is asked
Topic；Matching problem is effectively improved by the non-linearization predistorter topological structure of Pi types simultaneously；The non-linearization of the structure
Predistorter can be applicable polytype radio-frequency power amplifier, therefore analog predistortion power amplifier linearity correction electricity
The versatility on road is stronger, also, controls by MCU that the non-linearization predistorter can produce amplitude in real time and phase is directed to
In different radio frequency power amplifier and different predistortion third order intermodulation components, i.e., described analog predistortion power amplifier linearity
Circuit for rectifying can real time dynamic optimization different radio frequency power amplifier distortion, make that different radio-frequency power amplifiers exports three
The counteracting that rank intermodulation component can be maximized, so as to maintain the high linearity of radio-frequency power amplifier to export.
In addition, with reference to shown in figure 3, a kind of implementation of analog predistortion power amplifier linearity correction system is additionally provided
Example, the analog predistortion power amplifier linearity correction system include radio-frequency power amplifier, and any of the above-described embodiment
Described analog predistortion power amplifier linearity circuit for rectifying, the analog predistortion power amplifier linearity circuit for rectifying
Signal output interface connects the signal input part of the radio-frequency power amplifier.
In the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, and does not have the portion being described in detail in some embodiment
Point, it may refer to the associated description of other embodiments.It is appreciated that wherein used term " first ", " second " etc. are at this
It is used to distinguish object in text, but these objects should not be limited by these terms.
Embodiment described above only expresses several embodiments of the present utility model, it is impossible to is interpreted as to the utility model
The limitation of the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, the utility model structure is not being departed from
On the premise of think of, various modifications and improvements can be made, these belong to the scope of protection of the utility model.Therefore, this reality
It should be determined by the appended claims with the protection domain of new patent.
Claims (5)
- A kind of 1. analog predistortion power amplifier linearity circuit for rectifying, it is characterised in that including：First variable power amplifies Device, the first non-linear distortion unit, the second non-linear distortion unit, the 3rd non-linear distortion unit and the second variable power are put Big device；The signal input part connection signal input interface of first variable power amplifier, first variable power amplifier Signal output part connect the signal input part of the first non-linear distortion unit, the letter of the second non-linear distortion unit respectively Number input, the signal output part of the second non-linear distortion unit connect the signal input of the 3rd non-linear distortion unit respectively End, the signal input part of the second variable power amplifier, the output end of the first non-linear distortion unit, the 3rd non-linear distortion list The signal output part of member is all connected to ground, the signal output part of second variable power amplifier as signal output interface, For connecting corresponding radio-frequency power amplifier；The first non-linear distortion unit, the second non-linear distortion unit, the 3rd non-linear distortion unit composition one are non-linear Predistorter, the first non-linear distortion unit, the 3rd non-linear distortion unit are used to radio frequency link signal gain and compensated, and second Non-linear distortion unit is used for the phase compensation of radio frequency link signal.
- 2. analog predistortion power amplifier linearity circuit for rectifying according to claim 1, it is characterised in that also include MCU and temperature sensor；The temperature sensor connects the MCU, and the MCU is also respectively connected with the control terminal of the first variable power amplifier, the The control terminal of two variable power amplifiers, the MCU are also respectively connected with the first non-linear distortion unit, the second non-linear distortion list Member, the 3rd non-linear distortion unit.
- 3. analog predistortion power amplifier linearity circuit for rectifying according to claim 2, it is characterised in that first is non-thread Property distortion unit is identical with the circuit structure of the 3rd non-linear distortion unit, includes：First nonlinear component device, biased electrical Road, the first matching circuit for rectifying；One end of the biasing circuit connects the MCU, the biasing circuit and the other end connects One end of the first nonlinear component device, the other end of the first nonlinear component device pass through the described first matching correction electricity Road is connected to ground；Second non-linear distortion unit includes：Second nonlinear component device and the second matching circuit for rectifying；Described second is non-linear Measuring device connects the MCU by the described second matching circuit for rectifying；One end of the first nonlinear component device in the first non-linear distortion unit also passes through second nonlinear component Device connects one end of the first nonlinear component device in the second non-linear distortion unit.
- 4. analog predistortion power amplifier linearity circuit for rectifying according to claim 3, it is characterised in that described first Nonlinear component device, the second nonlinear component device are the Schottky two of the third order intermodulation component of producing with nonlinear characteristic Pole pipe.
- A kind of 5. analog predistortion power amplifier linearity correction system, it is characterised in that including radio-frequency power amplifier, and Any described analog predistortion power amplifier linearity circuit for rectifying of Claims 1-4, the analog predistortion power amplification The signal output interface of the linear circuit for rectifying of device connects the signal input part of the radio-frequency power amplifier.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721018939.6U CN207070019U (en) | 2017-08-15 | 2017-08-15 | Analog predistortion power amplifier linearity circuit for rectifying and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721018939.6U CN207070019U (en) | 2017-08-15 | 2017-08-15 | Analog predistortion power amplifier linearity circuit for rectifying and system |
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| CN207070019U true CN207070019U (en) | 2018-03-02 |
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| CN201721018939.6U Active CN207070019U (en) | 2017-08-15 | 2017-08-15 | Analog predistortion power amplifier linearity circuit for rectifying and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110912520A (en) * | 2019-11-15 | 2020-03-24 | 电子科技大学 | Digital-analog hybrid double-domain linearizer |
| CN111064438A (en) * | 2019-12-25 | 2020-04-24 | 北京普能微电子科技有限公司 | Analog predistortion circuit, power amplifier and radio frequency module |
-
2017
- 2017-08-15 CN CN201721018939.6U patent/CN207070019U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110912520A (en) * | 2019-11-15 | 2020-03-24 | 电子科技大学 | Digital-analog hybrid double-domain linearizer |
| CN111064438A (en) * | 2019-12-25 | 2020-04-24 | 北京普能微电子科技有限公司 | Analog predistortion circuit, power amplifier and radio frequency module |
| CN111064438B (en) * | 2019-12-25 | 2023-12-08 | 北京普能微电子科技有限公司 | Analog predistortion circuit, power amplifier and radio frequency module |
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