CN109286377A - The linearization process circuit and method of radiofrequency signal - Google Patents
The linearization process circuit and method of radiofrequency signal Download PDFInfo
- Publication number
- CN109286377A CN109286377A CN201710604121.0A CN201710604121A CN109286377A CN 109286377 A CN109286377 A CN 109286377A CN 201710604121 A CN201710604121 A CN 201710604121A CN 109286377 A CN109286377 A CN 109286377A
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- Prior art keywords
- amplifying circuit
- circuit
- predistorter
- radio
- input signals
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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
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
-
- 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
- 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
-
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
Abstract
The invention discloses the linearization process circuits and method of a kind of radiofrequency signal, the circuit includes predistorter, and the power amplification circuit being connect with the output end of predistorter, the power amplification circuit includes the sub- amplifying circuit of predetermined number, every sub- amplifying circuit includes the status adjustment line that power distribution unit, amplifier and design interconnected have coupling network, and the coupling network of every sub- amplifying circuit is connected separately with decaying phase-shift network；The predistorter includes the input interface and an output interface of the predetermined number, input interface is for receiving radio-frequency input signals, and each coupled signal transmitted by each decaying phase-shift network is received, output interface is used to each coupled signal and radio-frequency input signals being transmitted to the power amplification circuit.The present invention is more obvious to the linearization process effect of radiofrequency signal effectively, and power amplifier is supporting broadband to mix the efficiency under mould field scape and be improved, and complete machine does not have to additionally increase the ruler that radiates, and reduces cost.
Description
Technical field
The present invention relates to the linearization process circuits and side of radio-frequency power amplifier field more particularly to a kind of radiofrequency signal
Method.
Background technique
With the development of communication technology, operator is higher and higher to the compliance of communication system, especially mixed in broadband
Mould field scape need to support various modes, including but not limited to GSM (Global System for Mobile simultaneously
Communication, global system for mobile communications), CDMA (Code Division Multiple Access, CDMA),
UMTS (Universal Mobile Telecommunications System, Universal Mobile Communication System), LTE (Long
Term Evolution, long term evolution) isotype, this is very high to the linearity requirements of power amplifier, therefore the linearization technique used
It is also required to further increase.
Currently, most common linearization technique includes back-off, feedforward and predistortion.
The high power amplifier design technology that back-off technology is referred to as in the industry, using from 1dB compression point (P1dB) a large amount of power
It retracts, makes power amplifier work in the power dynamic of linearity range.The performance that this technology fully relies on amplifier tube itself is come
Guarantee the linear index of power amplifier, it is suitble to small-power (not exceeding 50W generally) and linear index is of less demanding (such as
The amplification of single carrier frequency CDMA signal power) standard use, (such as multi-carrier frequency CDMA and WCDMA is required for high-power and High Linear
(Wideband Code Division Multiple Access, wideband code division multiple access) signal amplification) use environment then without
Method uses.
Feed-forward technique is using non-thread in two signal cancellation loop reverse phases counteracting elimination power amplifier output signals
Property distortion product, realizes the linearisation purpose of power amplifier, reaches the Linear Amplifer index for fully meeting system requirements, this skill
Art has linearization process bandwidth (maximum high (maximum up to 25dB) and technology maturation up to 30MHz), linear improvement index
It is easy the advantages of design is realized, but it is relative complex due to constituting, it may have and conformity of production is difficult to hold and cost compares
High disadvantage.
Digital pre-distortion technology is a kind of radio-frequency power amplifier linearization technique of mainstream in recent years, can overcome above-mentioned two
Defect existing for kind of technology, but it is to rely on insertion nonlinear transport link -- predistorter in input channel, using pre-
Distorter opposite nonlinear characteristic orthogonal with power amplifier, offsets the nonlinearity product of power amplifier, realizes that the linearisation of power amplifier refers to
Mark.The broadband to become increasingly complex is needed support however as power amplifier and mixes moulded-on type, is difficult to meet using conventional digital pre-distortion
Linear index under mixed mould field scape, needs to be designed with bigger or more power tubes, power amplifier is caused to mix due to support
Mould, efficiency aspect make biggish sacrifice, and the heat dissipation of complete machine is also unable to reach requirement, can only increase the size of heat dissipation ruler to improve
Heat dissipation, to increase cost.
Summary of the invention
The main purpose of the present invention is to provide the linearization process circuits and method of a kind of radiofrequency signal, it is intended to solve existing
There is defect existing for technology.
To achieve the above object, the present invention provides a kind of linearization process circuit of radiofrequency signal, the radiofrequency signal
Linearization process circuit includes: that the circuit includes predistorter, and the power amplification connecting with the output end of predistorter
Circuit, the power amplification circuit include the sub- amplifying circuit of predetermined number, and every sub- amplifying circuit includes function interconnected
Rate distributor, amplifier and design have the status adjustment line of coupling network, and the coupling network of every sub- amplifying circuit connects respectively
It is connected to decaying phase-shift network；
The predistorter includes the input interface and an output interface of the predetermined number, and input interface is for receiving
Radio-frequency input signals, and each coupled signal by each decaying phase-shift network transmission is received, output interface is used for will be each
A coupled signal and radio-frequency input signals are transmitted to the power amplification circuit.
Optionally, be connected between the predistorter and the power amplification circuit pre- promotion grade amplifying circuit and/or
Push grade amplifying circuit.
Optionally, the sub- amplifying circuit is main amplifying circuit or auxiliary amplifying circuit, the state tune in main amplifying circuit
Nodel line is that high-impedance state adjusts line, and the status adjustment line in auxiliary amplifying circuit is that open-circuit condition adjusts line.
Optionally, pre- promotion grade is connected between the power distribution unit and the first amplifier on the main amplifying circuit to put
Big circuit and/or promotion grade amplifying circuit.
Optionally, phase adjusted is connected between the power distribution unit and the second amplifier on the auxiliary amplifying circuit
Line.
Optionally, the coupling network can be arranged for integrated coupler or microstrip coupler, the coupling network in micro-strip
On transmission line.
Optionally, the decaying phase-shift network includes the attenuation network and phase-shift network of head and the tail connection, the attenuation network
It can be fixed attenuator or voltage-controlled attenuator, the mobile network can be fixed phase shifter or electronic control type phase shifter.
In addition, to achieve the above object, the present invention also provides a kind of Linearization Method of radiofrequency signal, applied to penetrating
In the linearization process circuit of frequency signal, the Linearization Method of the radiofrequency signal includes:
When receiving radio-frequency input signals by predistorter, the radio-frequency input signals is transmitted to power amplification electricity
Road；
By the power amplification circuit, the radio-frequency input signals is transmitted separately to the son amplification electricity of predetermined number
Road, to be coupled in the coupling network of each sub- amplifying circuit, to obtain coupled signal；
Each coupled signal is passed back into the pre- mistake by the decaying phase-shift network of each sub- amplifying circuit connection respectively
True device；
It is handled in the predistorter with radio-frequency input signals, the radiofrequency signal after obtaining linearization process.
Optionally, described when receiving radio-frequency input signals by predistorter, the radio-frequency input signals is transmitted
Include: to the step of power amplification circuit
When receiving radio-frequency input signals by predistorter, the radio-frequency input signals is transmitted to pre- promotion grade and is put
Big circuit and/or promotion grade amplifying circuit amplify；
Amplified radio-frequency input signals is transmitted to power amplification circuit.
Optionally, it is handled in the predistorter with radio-frequency input signals, the radio frequency after obtaining linearization process
After the step of signal, the method also includes:
Radio signal transmission after treatment into the main amplifying circuit and auxiliary amplifying circuit of the power amplification circuit,
And be transmitted in main amplifying circuit and the corresponding coupling network of auxiliary amplifying circuit and coupled, to be back to predistorter progress
Linearization process；And
Treated that radiofrequency signal is exported by remaining.
The linearization process circuit of technical solution proposed by the present invention, radiofrequency signal includes predistorter, and is lost with pre-
The power amplification circuit of the output end connection of true device, power amplification circuit includes multiple sub- amplifying circuit, and the present invention passes through function
Each sub- amplifying circuit of rate amplifying circuit couples after amplifying to radio-frequency input signals, then by each coupled signal by declining
Subtract phase-shift network to pass back in predistorter, to be overlapped in predistorter to radio-frequency input signals and each coupled signal,
Realize that the linearization process of radiofrequency signal, the present invention utilize predistorter opposite nonlinear characteristic orthogonal with power amplifier, support
Disappear the nonlinearity product of power amplifier, realizes the linearisation index of power amplifier, and carry out pre-distortions by multiple sub- amplifying circuits, can
The broadband that becomes increasingly complex is supported to mix moulded-on type, to meet the linear index under mixed mould field scape, compared to traditional processing mode,
It is more obvious effectively to linearize effect, power amplifier is supporting broadband to mix the efficiency under mould field scape and be improved, and complete machine does not have to additional increase
Add heat dissipation ruler, reduces cost.
Detailed description of the invention
Fig. 1 is traditional digital pre-distortion schematic illustration；
Fig. 2 is the structural schematic diagram that traditional digital pre-distortion is applied；
Fig. 3 is the structural schematic diagram of the linearization process circuit 3rd embodiment of radiofrequency signal of the present invention；
Fig. 4 is coupler structure schematic diagram of the invention；
Fig. 5 is the structural schematic diagram of the linearization process circuit sixth embodiment of radiofrequency signal of the present invention；
Fig. 6 is attenuator structure schematic diagram of the invention；
Fig. 7 is phase shifter structure schematic diagram of the invention；
Fig. 8 is the curve synoptic diagram that traditional main road and bypass are respectively distorted；
Fig. 9 is that traditional main road and bypass distortion curve are superimposed schematic diagram；
Figure 10 is the schematic diagram of invention power amplifier linearization processing；
Figure 11 is the first pass schematic diagram of the Linearization Method of invention radiofrequency signal；
Figure 12 is the second procedure schematic diagram of the Linearization Method of invention radiofrequency signal.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
It should be noted that digital pre-distortion technology is a kind of radio-frequency power amplifier linearisation skill of mainstream in recent years
Art, it is to rely in input channel insertion Nonlinear Processing link -- predistorter, power amplifier output signal into
Row coupling, inputs predistorter after obtaining coupled signal, after pre-distortion algorithms, introduces relevant pre- mistake in the input signal
Then true component is superimposed in output end with the output signal of power amplifier, orthogonal opposite non-thread using predistorter and power amplifier
Property feature, offsets the nonlinearity product of power amplifier, realizes the linearisation index of power amplifier.
The principle signal of pre-distortion technology is corrected referring to Fig. 1 using the nonlinear characteristic curve of predistorter shown in line 1
The nonlinear characteristic curve of power amplifier shown in line 3 has just obtained linear character curve shown in line 2.
To be best understood from existing pre-distortion technology, by taking traditional two-way power amplifier as an example, conventional digital predistortion is answered
It is illustrated with technology, as shown in Figure 2.
One main power tube (Main Amplifier), an auxiliary power amplifier pipe (Peak Amplifier), main power amplifier work
Make in B class or AB class, auxiliary power amplifier works in C class.Two power amplifiers do not take turns to operate, but main power amplifier works always, auxiliary
The signal peak that assist is put into setting just works.
The main subsequent high-impedance state of power amplifier adjusts line and 35 ohm of variable resistance lines, it is therefore an objective in auxiliary power amplifier when not working,
Play the role of reducing the apparent impedance of main power tube, guarantees when auxiliary power amplifier work and what subsequent circuit formed has
Source load impedance is lower, and power amplifier output electric current main so just becomes larger.Due to having quatrter-wavelength line behind main power amplifier, in order to
So that two power amplifiers is exported same phase, phase adjusted line is also required to before auxiliary power amplifier.
It is to guarantee that auxiliary power amplifier pipe can closed when not working that the subsequent open-circuit condition of auxiliary power amplifier pipe, which adjusts line,
Open-circuit condition is presented at waypoint as far as possible, reducing influences the performance of main power tube.
When using digital pre-distortion technology, generally increases a coupling network in amplification circuit output end, use coupler
To realize that power couples, and attenuation network is connected to be adjusted to suitable size at coupling port, the signal of coupling is transferred to pre-
Distorter is handled.Input signal after predistorter processing as power amplifier, forms an adaptive close ring
Road enables amplifying circuit to reach optimal linear.
As can be seen from Figure 2, since the signal peak of auxiliary power amplifier to setting just works, as power amplifier needs to prop up
It holds the broadband to become increasingly complex and mixes moulded-on type, be difficult to meet the linear index under mixed mould field scape using conventional digital pre-distortion,
It needs to be designed with bigger or more power tubes, causes power amplifier due to support mixed mould, made in terms of efficiency biggish
It sacrifices, the heat dissipation of complete machine is also unable to reach requirement, can only increase the size of heat dissipation ruler to improve heat dissipation, or under high temperature scene
Drop volume uses, and has slackened the competitiveness of complete machine significantly.
The solution of the embodiment of the present invention is mainly: defeated to radio frequency by each sub- amplifying circuit of power amplification circuit
Enter after signal amplifies and couple, then each coupled signal is passed back in predistorter by phase-shift network of decaying, pre-
Distorter is overlapped radio-frequency input signals and each coupled signal, realizes the linearization process of radiofrequency signal, is lost using pre-
True device opposite nonlinear characteristic orthogonal with power amplifier, offsets the nonlinearity product of power amplifier, realizes the linearisation index of power amplifier,
And pre-distortion is carried out by multiple sub- amplifying circuits, the broadband to become increasingly complex can be supported to mix moulded-on type, to meet mixed mould
Linear index under scene, compared to traditional processing mode, linearisation effect is more obvious effectively, and power amplifier is supporting broadband mixed
Efficiency under mould field scape is improved, and complete machine does not have to additional increase heat dissipation ruler, reduces cost.To solve existing radiofrequency signal
The problem of linearization, efficiency is lower and higher cost.
Based on problem of the existing technology, the present invention proposes each implementation of the linearization process circuit of radiofrequency signal
Example.
It is proposed the first embodiment of the linearization process circuit of radiofrequency signal of the present invention.
In the present embodiment, the circuit includes predistorter, and the power connecting with the output end of predistorter is put
Big circuit, the power amplification circuit include the sub- amplifying circuit of the first predetermined number, and every sub- amplifying circuit includes mutually interconnecting
Power distribution unit, amplifier and the design connect has the status adjustment line of coupling network, the coupling network of every sub- amplifying circuit
It is connected separately with decaying phase-shift network；
The predistorter includes the input interface and an output interface of the second predetermined number, and input interface is for receiving
Radio-frequency input signals, and each coupled signal by each decaying phase-shift network transmission is received, output interface is used for will be each
A coupled signal and radio-frequency input signals are transmitted to the power amplification circuit.
The embodiment of the present invention, mainly on the basis of conventional digital predistortion linear technology, description Doherty power is put
The linearization technique of big device, so that the power amplifier of radiofrequency signal more linearizes, to solve to apply in the case where mould field scape is mixed in broadband, power amplifier
Linearity the case where being unable to reach index request.
In the present embodiment, the number of the sub- amplifying circuit can be two sub- amplifying circuits without limitation, can also be with
For according to the sub- amplifying circuit of actual needs setting three or other numbers.
In the present embodiment, the input interface of predistorter includes second predetermined number, second predetermined number
An input interface one, having more bigger than the first predetermined number connects for receiving radio-frequency input signals, remaining each input
Mouth is for receiving each coupled signal by each decaying phase-shift network transmission.That is, the number in sub- amplifying circuit is two
When, the input interface of predistorter includes three, and one is used to receive radio-frequency input signals, other two input interface is for connecing
Receive two coupled signals by two decaying phase-shift network transmission；When the number of sub- amplifying circuit is three, predistorter
Input interface include four, one for receiving radio-frequency input signals, the other three input interface passes through three for receiving
Three coupled signals that phase-shift network of decaying transmits.
In the present embodiment, when receiving radio-frequency input signals in predistorter, predistorter inputs the radio frequency
Signal is transmitted to each sub- amplifying circuit of power amplification circuit, the function that then radio-frequency input signals passes through every sub- amplifying circuit
Rate distributor is transmitted in corresponding amplifier and amplifies, and then again has amplified radio-frequency input signals by design
The status adjustment line of coupling network is coupled, and coupled signal is obtained, since the coupling network of every sub- amplifying circuit connects respectively
It is connected to decaying phase-shift network, therefore, obtained each coupled signal is back to by corresponding decaying phase-shift network described pre-
In distorter, the linearization process of radiofrequency signal is carried out.
It should be noted that each coupled signal is overlapped by predistorter with radio-frequency input signals at this time, to obtain
The linearization process of radiofrequency signal can be realized in superimposed radiofrequency signal.
The linearization process circuit of technical solution proposed by the present invention, radiofrequency signal includes predistorter, and is lost with pre-
The power amplification circuit of the output end connection of true device, power amplification circuit includes multiple sub- amplifying circuit, and the present invention passes through function
Each sub- amplifying circuit of rate amplifying circuit couples after amplifying to radio-frequency input signals, then by each coupled signal by declining
Subtract phase-shift network to pass back in predistorter, to be overlapped in predistorter to radio-frequency input signals and each coupled signal,
Realize that the linearization process of radiofrequency signal, the present invention utilize predistorter opposite nonlinear characteristic orthogonal with power amplifier, support
Disappear the nonlinearity product of power amplifier, realizes the linearisation index of power amplifier, and carry out pre-distortions by multiple sub- amplifying circuits, can
The broadband that becomes increasingly complex is supported to mix moulded-on type, to meet the linear index under mixed mould field scape, compared to traditional processing mode,
It is more obvious effectively to linearize effect, power amplifier is supporting broadband to mix the efficiency under mould field scape and be improved, and complete machine does not have to additional increase
Add heat dissipation ruler, reduces cost.
Further, propose that the second of the linearization process circuit of radiofrequency signal of the present invention implements based on first embodiment
Example.
In the present embodiment, pre- promotion grade amplifying circuit is connected between the predistorter and the power amplification circuit
And/or push grade amplifying circuit.
It should be understood that the processed signal power of predistorter is typically small in practical power amplifier design, in order to full
The powerful application of foot, be connected between the predistorter and the power amplification circuit pre- promotion grade amplifying circuit and/or
After pushing grade amplifying circuit, the radio-frequency input signals of the output of predistorter that need to first pass through above-mentioned amplifying circuit amplification, then transmit
It is amplified to power amplification circuit.
Specifically, including three kinds of situations:
The first: being connected with pre- promotion grade amplifying circuit between predistorter and power amplification circuit；
Second: being connected between predistorter and power amplification circuit and push grade amplifying circuit；
The third: being connected with pre- promotion grade amplifying circuit between predistorter and power amplification circuit and pushes grade amplification electricity
Road, the pre- promotion grade amplifying circuit and the promotion grade amplifying circuit are connected with each other.
In the present embodiment, by the pre- promotion grade amplifying circuit that is connected between predistorter and power amplification circuit and/or
Grade amplifying circuit is pushed, the radio-frequency input signals for being transferred to power amplification circuit from predistorter can be amplified, so that radio frequency
The amplification effect of input signal is more obvious.
Further, referring to Fig. 3, the of the linearization process circuit of radiofrequency signal of the present invention is proposed based on first embodiment
Three embodiments.
The first of the linearization process circuit of the 3rd embodiment and radiofrequency signal of the linearization process circuit of radiofrequency signal
The difference of embodiment is that the sub- amplifying circuit includes main amplifying circuit and auxiliary amplifying circuit, the shape in main amplifying circuit
It is that high-impedance state adjusts line that state, which adjusts line, and the status adjustment line in auxiliary amplifying circuit is that open-circuit condition adjusts line；
Phase adjusted line is connected between on power distribution unit and amplifier on the auxiliary amplifying circuit.
In this example, to be best understood from, the specific structure of the linearization process circuit of radiofrequency signal is described in detail, referring to Fig. 3,
The circuit includes predistorter, and the power amplification circuit connecting with the output end of predistorter, the power amplification electricity
The sub- amplifying circuit on road includes main amplifying circuit and auxiliary amplifying circuit.
Wherein, main amplifying circuit includes that power distribution unit, the first amplifier and design interconnected have the first coupling
The status adjustment line of network, the status adjustment line in main amplifying circuit are that high-impedance state adjusts line, the first coupling of main amplifying circuit
Closing network connection has the first decaying phase-shift network；Wherein, first coupling network couples to obtain for the power of main road power amplifier
First coupled signal is input to predistorter then by the adjustment of the first decaying phase-shift network.
Auxiliary amplifying circuit includes the shape that power distribution unit, the second amplifier and design interconnected have coupling network
State adjusts line, and the status adjustment line in auxiliary amplifying circuit is that open-circuit condition adjusts line, and the coupling network of auxiliary amplifying circuit connects
It is connected to decaying phase-shift network, is connected with phase adjusted between the power distribution unit and amplifier on the auxiliary amplifying circuit
Line；Wherein, second coupling network couples to obtain the second coupled signal for the power of bypass power amplifier, then declines by second
The adjustment for subtracting phase-shift network, is input to predistorter.
It should be noted that the power distribution unit in the main amplifying circuit and the auxiliary amplifying circuit is same
Power distribution unit, i.e. main amplifying circuit and the auxiliary amplifying circuit share the power distribution unit.
In the present embodiment, referring to Fig. 3, due to including main amplifying circuit and auxiliary amplification electricity inside power amplification circuit
Road, therefore, the input interface of predistorter include three, and predistorter passes through an interface radio-frequency input signals RFin,
After receiving radio-frequency input signals, the radio-frequency input signals is transmitted to the main amplifying circuit and auxiliary of power amplification circuit
In amplifying circuit.
At this point, radio-frequency input signals by the power distribution unit of main amplifying circuit be transmitted to the first amplifier (Fig. 3's
Main it) amplifies, amplified radio-frequency input signals is then transmitted to the high-impedance state tune that design has the first coupling network
In nodel line, to obtain the first coupled signal, then the first decaying phase shift net that the first coupled signal is connected by main amplifying circuit
Passed back in the predistorter in network；
Meanwhile radio-frequency input signals is transmitted to second by phase adjusted line from the power distribution unit of auxiliary amplifying circuit
Amplifier (Peak of Fig. 3) amplifies, and amplified radio-frequency input signals, which is then transmitted to design, the second coupling network
Open-circuit condition adjust in line, to obtain the second coupled signal, then the second coupled signal is connected by auxiliary amplifying circuit
Pass back in the predistorter in second decaying phase-shift network.
The predistorter receives the first decaying phase-shift network and the second decaying by remaining two input interfaces respectively
First and second coupled signals of phase-shift network transmission, then carry out receive two coupled signals and radio-frequency input signals
Superposition, obtains superimposed radiofrequency signal, and superimposed radiofrequency signal RFout is finally passed through 35 ohm of variable resistance lines and circulator
It is exported.
As can be seen from Figure 3, closed loop link 1 and closed loop link 2 are respectively formed in main amplifying circuit and auxiliary amplifying circuit.
The present invention is preferably described in detail for applying in two-way Doherty amplifying circuit.It should be noted that in reality
Under the mixed mould field scape on border, the factors such as efficiency, power, linear index, technical solution of the present invention are more to apply in order to balance
In three road Doherty amplifying circuits.
In the present embodiment, using predistorter opposite nonlinear characteristic orthogonal with power amplifier, the non-of power amplifier is offset
Linear product realizes the linearisation index of power amplifier, and carries out pre-distortion by multiple sub- amplifying circuits, can support increasingly
Moulded-on type is mixed in complicated broadband, to meet the linear index under mixed mould field scape, compared to traditional processing mode, linearizes effect
More obvious effectively power amplifier mixes the efficiency under mould field scape in support broadband and is improved, and complete machine does not have to additionally increase heat dissipation ruler, subtracts
Small cost.
Further, propose that the 4th of the linearization process circuit of radiofrequency signal of the present invention implements based on 3rd embodiment
Example.
The third of the linearization process circuit of the fourth embodiment and radiofrequency signal of the linearization process circuit of radiofrequency signal
The difference of embodiment is, is connected with pre- promotion grade between the power distribution unit and the first amplifier on the main amplifying circuit
Amplifying circuit and/or promotion grade amplifying circuit.
It should be understood that the processed signal power of predistorter is typically small in practical power amplifier design, in order to full
Foot powerful application is connected with pre- promotion grade between the power distribution unit and the first amplifier on the main amplifying circuit and puts
Big circuit and/or promotion grade amplifying circuit, the radio-frequency input signals of the output of predistorter need to first pass through above-mentioned amplifying circuit and put
After big, then it is transmitted to power amplification circuit and amplifies.
In the present embodiment, including three kinds of situations:
The first: being connected with pre- promotion grade amplifying circuit between power distribution unit and the first amplifier；
Second: being connected between power distribution unit and the first amplifier and push grade amplifying circuit；
The third: being connected with pre- promotion grade amplifying circuit between power distribution unit and the first amplifier and pushes grade amplification
Circuit, the pre- promotion grade amplifying circuit and the promotion grade amplifying circuit are connected with each other.
In the present embodiment, the pre- promotion grade amplifying circuit that is connected between power distribution unit and the first amplifier and/or push away
Dynamic grade amplifying circuit, can amplify the radio-frequency input signals that the first amplifier is transferred to from power distribution unit, so that radio frequency
The amplification effect of input signal is more obvious.
Further, the 5th of the linearization process circuit of radiofrequency signal of the present invention is proposed based on first to fourth embodiment
Embodiment.
The first of the linearization process circuit of the 5th embodiment and radiofrequency signal of the linearization process circuit of radiofrequency signal
Difference to fourth embodiment is that the coupling network can set for integrated coupler or microstrip coupler, the coupling network
It sets on microstrip transmission line.
In the present embodiment, integrated coupler can be used in coupling network, also uses microstrip coupler.It needs to illustrate
It is, since Doherty amplifying circuit output matched design is related to impedance transformation, when designing microstrip coupler, due to single function
The curve dullness of link is put without inflection point, the directivity requirement of coupler can be reduced herein, coupling branch can be designed 50
Ohm microstrip transmission line can also specifically can refer to Fig. 4 in design on the microstrip transmission line of other impedances.
Further, the 6th of the linearization process circuit of radiofrequency signal of the present invention is proposed based on first to fourth embodiment
Embodiment.
The first of the linearization process circuit of the sixth embodiment and radiofrequency signal of the linearization process circuit of radiofrequency signal
Difference to fourth embodiment is, referring to Fig. 5, the decaying phase-shift network includes the attenuation network and phase shift net of head and the tail connection
Network.I.e. first decaying phase-shift network includes the first attenuation network and the first phase-shift network, and the second decaying phase-shift network includes second
Attenuation network and the second phase-shift network,
Wherein, the attenuation network can be fixed attenuator or voltage-controlled attenuator, and the mobile network can be fixed phase shift
Device or electronic control type phase shifter.
That is, attenuation network and phase-shift network in the design can be separately individually designed in the embodiment of the present invention,
It can concentrate and design in consolidated network, the present invention is preferentially with separately individually designed.
In the present embodiment, fixed attenuator can be used in attenuation network, and electronic control type attenuator also can be used, common
Pad design is as shown in Figure 6.It should be strongly noted that can be adopted all the way for simplicity and standardization in circuit design
With fixed attenuator, electronic control type attenuator is used all the way, specifically which kind of attenuator which uses without limitation.
Fixed phase shifter can be used in phase-shift network, electronic control type phase shifter also can be used, common phase shifter design is such as
Shown in Fig. 7.It should be strongly noted that fixed phase shifter can be used all the way for simplicity and standardization in circuit design,
Electronic control type phase shifter is used all the way, and similarly, specifically which kind of attenuator which uses without limitation.
Those skilled in the art are it is to be understood that the above-mentioned all parts referred to can be designed in same veneer
On, it is also possible to it designs on different veneers, and unrestricted in any specific hardware and software combination.
It should be noted that the unlatching of main road and bypass and compressive state be not identical, therefore in Doherty framework
There is part after the superposition of the distortion curve of main road and bypass and turn in the distortion curve of traditional power amplifier more than complexity shown in FIG. 1
Point as shown in figure 8, but main road and the respective distortion curve of bypass are the curve of no inflection point, as shown in Figure 9.
Using technical solution of the present invention, pre-distortion can be carried out by the signal to main road and bypass respectively, than traditional
More ideal calibration result can be obtained in pre-distortion technology, and predistorter is more easier to handle, and improves broadband and mixes under mould field scape
The linearity of power amplifier makes power amplifier that broadband supported to mix the efficiency under mould field scape and be improved, complete machine does not have to additional as shown in Figure 10
Increase heat dissipation ruler, at high temperature without drop volume, improves the competitiveness of complete machine.
In conclusion the present invention improves applicability of the Doherty power amplifier under mixed mould field scape, and make under rated power
The linear index that moulded-on type is mixed in broadband is obviously improved, and can be widely used in broadband and be mixed Doherty power amplification electricity under mould field scape
Lu Zhong.
Present invention further propose that each embodiment of the Linearization Method of radiofrequency signal.
Referring to Fig.1 1, propose the first embodiment of the Linearization Method of radiofrequency signal of the present invention.
In the present embodiment, the method is applied in the linearization process circuit of radiofrequency signal described above, described
The Linearization Method of radiofrequency signal includes:
When receiving radio-frequency input signals by predistorter, the radio-frequency input signals is transmitted to power amplification electricity
Road；By the power amplification circuit, the radio-frequency input signals is transmitted separately to the sub- amplifying circuit of predetermined number, with
It is coupled in the coupling network of each sub- amplifying circuit, to obtain coupled signal；Each coupled signal is passed through respectively each
The decaying phase-shift network of sub- amplifying circuit connection passes back to the predistorter；In the predistorter with radio-frequency input signals
It is overlapped, the radiofrequency signal after obtaining linearization process.
It is the specific steps that the Linearization Method of radiofrequency signal is realized in the present embodiment below:
The radio-frequency input signals is transmitted to function when receiving radio-frequency input signals by predistorter by step S10
Rate amplifying circuit；
The radio-frequency input signals is transmitted separately to the son of predetermined number by the power amplification circuit by step S20
Amplifying circuit, to be coupled in the coupling network of each sub- amplifying circuit, to obtain coupled signal；
Step S30 passes back to each coupled signal by the decaying phase-shift network of each sub- amplifying circuit connection respectively
The predistorter；
Step S40 is handled in the predistorter with radio-frequency input signals, the radio frequency after obtaining linearization process
Signal.
In the present embodiment, it is described in detail so that sub- amplifying circuit is main amplifying circuit and auxiliary amplifying circuit as an example:
Predistorter is penetrated after receiving radio-frequency input signals by described by an interface radio-frequency input signals
Frequency input signal is transmitted in the main amplifying circuit and auxiliary amplifying circuit of power amplification circuit, and radio-frequency input signals is put by master
The power distribution unit of big circuit is transmitted to the first amplifier and amplifies, and is then transmitted to amplified radio-frequency input signals
Design has the high-impedance state of the first coupling network to adjust in line, to obtain the first coupled signal, then the first coupled signal is passed through
Pass back in the predistorter in first decaying phase-shift network of main amplifying circuit connection；Meanwhile radio-frequency input signals is from auxiliary
It helps the power distribution unit of amplifying circuit to be transmitted to the second amplifier by phase adjusted line to amplify, it then will be amplified
Radio-frequency input signals, which is transmitted to design, has the open-circuit condition of the second coupling network to adjust in line, to obtain the second coupled signal, then
By the second coupled signal by auxiliary amplifying circuit connect second decaying phase-shift network in pass back in the predistorter.
The predistorter receives the first decaying phase-shift network and the second decaying by remaining two input interfaces respectively
First and second coupled signals of phase-shift network transmission, then carry out receive two coupled signals and radio-frequency input signals
Superposition, obtains superimposed radiofrequency signal, and superimposed radiofrequency signal RFout is finally passed through 35 ohm of variable resistance lines and circulator
It is exported.
The present embodiment propose technical solution, the linearization process circuit of radiofrequency signal includes predistorter, and with it is pre-
The power amplification circuit of the output end connection of distorter, power amplification circuit includes multiple sub- amplifying circuit, and the present invention passes through
Each sub- amplifying circuit of power amplification circuit couples after amplifying to radio-frequency input signals, then each coupled signal is passed through
Decaying phase-shift network passes back in predistorter, to fold in predistorter to radio-frequency input signals and each coupled signal
Add, realize that the linearization process of radiofrequency signal, the present invention utilize predistorter opposite nonlinear characteristic orthogonal with power amplifier,
The nonlinearity product for offsetting power amplifier, realizes the linearisation index of power amplifier, and carries out pre-distortions by multiple sub- amplifying circuits,
The broadband to become increasingly complex can be supported to mix moulded-on type, to meet the linear index under mixed mould field scape, compared to traditional processing side
Formula, linearisation effect is more obvious effectively, and power amplifier is supporting broadband to mix the efficiency under mould field scape and be improved, and complete machine does not have to additional
Increase heat dissipation ruler, reduces cost.
Further, propose that the second of the Linearization Method of radiofrequency signal of the present invention implements based on first embodiment
Example.
The Linearization Method second embodiment of radiofrequency signal and the Linearization Method first of radiofrequency signal are implemented
The difference of example is, referring to Fig.1 2, the step S10 includes:
The radio-frequency input signals is transmitted to pre- by step S11 when receiving radio-frequency input signals by predistorter
It pushes grade amplifying circuit and/or grade amplifying circuit is pushed to amplify；
Amplified radio-frequency input signals is transmitted to power amplification circuit by step S12.
In the present embodiment, including three kinds of situations:
The first: being connected with pre- promotion grade amplifying circuit between predistorter and power amplification circuit；
Second: being connected between predistorter and power amplification circuit and push grade amplifying circuit；
The third: being connected with pre- promotion grade amplifying circuit between predistorter and power amplification circuit and pushes grade amplification electricity
Road, the pre- promotion grade amplifying circuit and the promotion grade amplifying circuit are connected with each other.
By the pre- promotion grade amplifying circuit connected between predistorter and power amplification circuit and/or push grade amplification electricity
Road can amplify the radio-frequency input signals that power amplification circuit is transferred to from predistorter, so that radio-frequency input signals is put
Big effect is more obvious.
Further, the third of the Linearization Method of radiofrequency signal of the present invention is proposed based on first or second embodiments
Embodiment.
The Linearization Method 3rd embodiment of radiofrequency signal and the Linearization Method the first or the of radiofrequency signal
The difference of two embodiments is, after the step S30, the method also includes:
Radio signal transmission after treatment into the main amplifying circuit and auxiliary amplifying circuit of the power amplification circuit,
And be transmitted in main amplifying circuit and the corresponding coupling network of auxiliary amplifying circuit and coupled, to be back to predistorter progress
Linearization process；And
Treated that radiofrequency signal is exported by remaining.
In the present embodiment, radio-frequency input signals and coupled signal are overlapped by predistorter, are penetrated with realizing
After the linearization process of frequency signal, a segment is intercepted in superimposed radiofrequency signal, the segment of the interception continues to be transmitted to
In the main amplifying circuit and auxiliary amplifying circuit of the power amplification circuit, to continue to execute above-mentioned linearization process process,
To carry out linearization process to the radio-frequency input signals re-entered.And treated radiofrequency signal, then pass through the main amplification
Circuit is exported, specifically: after superimposed radiofrequency signal is amplified by the first amplifier (Main shown in Fig. 3), being passed through
High-impedance state adjusts line and is transmitted to 35 ohm of variable resistance lines, also, after also being amplified by the second amplifier (Peak shown in Fig. 3),
Line is adjusted by open-circuit condition and is transmitted to 35 ohm of variable resistance lines, with after 35 ohm of variable resistance line bouts, by carrying out in circulator
Output exports radio frequency output signal (RFout).
It is appreciated that technical solution through this embodiment, sustainable to carry out linearization process to radio-frequency input signals, with
Guarantee the continuous linear treatment process of radiofrequency signal.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include the other elements being not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in storage as described above
In medium (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a terminal device (can be mobile phone, calculate
Machine, server, air conditioner or network equipment etc.) execute method described in each embodiment of the present invention.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of linearization process circuit of radiofrequency signal, the circuit include predistorter, and the output with predistorter
Hold the power amplification circuit of connection, which is characterized in that the power amplification circuit includes the sub- amplifying circuit of predetermined number, each
Sub- amplifying circuit includes the status adjustment line that power distribution unit, amplifier and design interconnected have coupling network, each
The coupling network of sub- amplifying circuit is connected separately with decaying phase-shift network；
The predistorter includes the input interface and an output interface of the predetermined number, and input interface is for receiving radio frequency
Input signal, and each coupled signal by each decaying phase-shift network transmission is received, output interface is used for each coupling
It closes signal and radio-frequency input signals is transmitted to the power amplification circuit.
2. linearization process circuit as described in claim 1, which is characterized in that the predistorter and power amplification electricity
It is connected with pre- promotion grade amplifying circuit between road and/or pushes grade amplifying circuit.
3. linearization process circuit as described in claim 1, which is characterized in that the sub- amplifying circuit be main amplifying circuit or
Auxiliary amplifying circuit, the status adjustment line in main amplifying circuit are that high-impedance state adjusts line, the state tune in auxiliary amplifying circuit
Nodel line is that open-circuit condition adjusts line.
4. linearization process circuit as claimed in claim 3, which is characterized in that the power distribution dress on the main amplifying circuit
It sets and is connected with pre- promotion grade amplifying circuit and/or promotion grade amplifying circuit between the first amplifier.
5. linearization process circuit as claimed in claim 3, which is characterized in that the power distribution on the auxiliary amplifying circuit
Phase adjusted line is connected between device and the second amplifier.
6. such as linearization process circuit described in any one of claim 1 to 5, which is characterized in that the coupling network can be collection
At coupler or microstrip coupler, the coupling network is arranged on microstrip transmission line.
7. such as linearization process circuit described in any one of claim 1 to 5, which is characterized in that the decaying phase-shift network packet
The attenuation network and phase-shift network of head and the tail connection are included, the attenuation network can be fixed attenuator or voltage-controlled attenuator, the shifting
Dynamic network can be fixed phase shifter or electronic control type phase shifter.
8. a kind of Linearization Method of radiofrequency signal, which is characterized in that the linearization process circuit applied to radiofrequency signal
In, the Linearization Method of the radiofrequency signal includes:
When receiving radio-frequency input signals by predistorter, the radio-frequency input signals is transmitted to power amplification circuit；
By the power amplification circuit, the radio-frequency input signals is transmitted separately to the sub- amplifying circuit of predetermined number, with
It is coupled in the coupling network of each sub- amplifying circuit, to obtain coupled signal；
Each coupled signal is passed back into the predistorter by the decaying phase-shift network of each sub- amplifying circuit connection respectively；
It is handled in the predistorter with radio-frequency input signals, the radiofrequency signal after obtaining linearization process.
9. the Linearization Method of radiofrequency signal as claimed in claim 8, which is characterized in that described to pass through predistorter
When receiving radio-frequency input signals, the step of radio-frequency input signals is transmitted to power amplification circuit, includes:
When receiving radio-frequency input signals by predistorter, the radio-frequency input signals is transmitted to pre- promotion grade and amplifies electricity
Road and/or promotion grade amplifying circuit amplify；
Amplified radio-frequency input signals is transmitted to power amplification circuit.
10. the Linearization Method of radiofrequency signal as claimed in claim 8 or 9, which is characterized in that in the predistorter
In handled with radio-frequency input signals, the step of radiofrequency signal after obtaining linearization process after, the method also includes:
Radio signal transmission after treatment is passed into the main amplifying circuit and auxiliary amplifying circuit of the power amplification circuit
It transports in main amplifying circuit and the corresponding coupling network of auxiliary amplifying circuit and is coupled, carried out linearly with being back to predistorter
Change processing；And
Treated that radiofrequency signal is exported by remaining.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710604121.0A CN109286377A (en) | 2017-07-21 | 2017-07-21 | The linearization process circuit and method of radiofrequency signal |
| PCT/CN2018/096517 WO2019015679A1 (en) | 2017-07-21 | 2018-07-20 | Radio frequency signal linearisation processing circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710604121.0A CN109286377A (en) | 2017-07-21 | 2017-07-21 | The linearization process circuit and method of radiofrequency signal |
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| CN109286377A true CN109286377A (en) | 2019-01-29 |
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| CN201710604121.0A Withdrawn CN109286377A (en) | 2017-07-21 | 2017-07-21 | The linearization process circuit and method of radiofrequency signal |
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| WO (1) | WO2019015679A1 (en) |
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|---|---|---|---|---|
| CN112968681A (en) * | 2021-02-02 | 2021-06-15 | 电子科技大学 | System and method for accurately extracting parameters of power amplifier model under Gaussian white noise background |
| CN114665907A (en) * | 2022-03-18 | 2022-06-24 | Oppo广东移动通信有限公司 | Radio frequency system and communication equipment |
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| US20080111622A1 (en) * | 2006-11-14 | 2008-05-15 | Roland Sperlich | Hybrid Doherty Amplifier System and Method |
| CN101589550A (en) * | 2006-09-29 | 2009-11-25 | 北方电讯网络有限公司 | Enhanced Doherty amplifier with asymmetrical semiconductor |
| CN103391057A (en) * | 2012-05-11 | 2013-11-13 | 京信通信系统（中国）有限公司 | Reverse F-type power amplifier and emitter as well as processing method |
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| CN101090381A (en) * | 2006-06-04 | 2007-12-19 | 三星电机株式会社 | Systems, methods, and apparatuses for multi-path orthogonal predistorters |
| US7860466B2 (en) * | 2006-06-04 | 2010-12-28 | Samsung Electro-Mechanics Company, Ltd. | Systems, methods, and apparatuses for linear polar transmitters |
| CN103107778B (en) * | 2012-12-31 | 2016-03-02 | 东南大学 | A kind of Doherty power amplifier and adjustment method thereof reducing third order intermodulation |
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- 2017-07-21 CN CN201710604121.0A patent/CN109286377A/en not_active Withdrawn
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| CN1770622A (en) * | 2004-11-05 | 2006-05-10 | 株式会社日立国际电气 | Amplifier |
| CN101589550A (en) * | 2006-09-29 | 2009-11-25 | 北方电讯网络有限公司 | Enhanced Doherty amplifier with asymmetrical semiconductor |
| US20080111622A1 (en) * | 2006-11-14 | 2008-05-15 | Roland Sperlich | Hybrid Doherty Amplifier System and Method |
| CN103391057A (en) * | 2012-05-11 | 2013-11-13 | 京信通信系统（中国）有限公司 | Reverse F-type power amplifier and emitter as well as processing method |
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| CN112968681A (en) * | 2021-02-02 | 2021-06-15 | 电子科技大学 | System and method for accurately extracting parameters of power amplifier model under Gaussian white noise background |
| CN112968681B (en) * | 2021-02-02 | 2023-04-25 | 电子科技大学 | System and method for accurately extracting parameters of power amplifier model under Gaussian white noise background |
| CN114665907A (en) * | 2022-03-18 | 2022-06-24 | Oppo广东移动通信有限公司 | Radio frequency system and communication equipment |
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| WO2019015679A1 (en) | 2019-01-24 |
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