CN109150118A - A kind of linearizer for travelling-wave tubes power amplifier pre-distortion - Google Patents
A kind of linearizer for travelling-wave tubes power amplifier pre-distortion Download PDFInfo
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- CN109150118A CN109150118A CN201810999363.9A CN201810999363A CN109150118A CN 109150118 A CN109150118 A CN 109150118A CN 201810999363 A CN201810999363 A CN 201810999363A CN 109150118 A CN109150118 A CN 109150118A
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- microstrip line
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- wave tubes
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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
- 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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Abstract
The present invention discloses a kind of linearizer for travelling-wave tubes power amplifier pre-distortion, it is non-linear inconsistent in frequency band to solve the problems, such as broad-band TWT, the present invention branch increasing degree balanced device and delayer above and below traditional two-way formula linearizer, the amplitude and phase difference of adjustment branch meets certain requirement, make to reach the nonlinear optimization of Broadband Matching travelling-wave tubes with travelling-wave tubes nonlinear curve Broadband Matching after two-way Vector modulation；Linearizer of the invention can the broader travelling-wave tubes of coupling bandwidth, compensation is made to non-linear can accurately adjust of travelling-wave tubes, be also applied for solid-state power amplifier linearisation.
Description
Technical field
The invention belongs to power amplifier field, in particular to a kind of linearization technique of traveling wave tube power amplifier.
Background technique
For example various multimedia services of the communication requirement increasingly increased with people rapidly develop, and the satellite business traffic is sharply
Increase, in order to accommodate more communication channels in limited spectral range, people increase communication bandwidth and propose some width
Modulation system (M-QAM etc.) with digital transmission technology (OFDM, WCDMA etc.) and high spectrum utilization.Using these technology institutes
The signal of transmission has the characteristics that non-constant-envelope, broadband and peak-to-average ratio, when modulated signal is put by nonlinear power
Band and out-of-band distortion will be generated after big device, output signal spectrum extension interferes adjacent channel, increases the communication system bit error rate.
Therefore, modern satellite communications system proposes very high requirement to the linearity of radio-frequency power amplifier；Simultaneously because bandwidth
Increase, travelling-wave tubes band internal characteristic includes that the especially non-linear dilation curve of gain, phase, group delay is inconsistent, is improved linear
The requirement of change technology.
There are many power amplifier linearization technology, and there are commonly back-off, feedforward, negative-feedback, LINC and predistortions etc..
Power back is a kind of traditional and effective method, however, the rollback of operating point reduces the power utilization efficiency of power amplifier simultaneously
Lead to very high heat dissipation；Feedforward can accomplish broadband amplification and high linearity, be a kind of current mature linearization technique, but
The disadvantage is that low efficiency and complexity, are not used to space environment；Negative-feedback is to exchange distortion suppression for gain, narrow bandwidth and steady
Qualitative question limits its application；Predistortion is divided into analog predistortion and digital pre-distortion, digital pre-distortion technology have stablize,
Efficiently, wide bandwidth and the advantages such as adaptive can reach moderate linearisation due to space environment effect, required high speed number
Word processing chip is limited in space environment application, and analog predistortion especially RF linear device is small in size, at low cost, in microwave
Millimeter wave frequency band is absolutely wide.
CN201210033598.5 discloses a kind of linearizer of traveling wave tube power amplifier, cannot be used for broadband line
In property device；CN101807886A discloses a kind of radio frequency power amplifying device and its predistortion is called method, wherein using
Complicated analog predistortion corrects system.
Traveling wave tube power amplifier is especially different in domestic travelling-wave tubes nonlinear characteristic frequency band due to technique
Cause, ordinary circumstance high band it is non-linear stronger.The non-linear dilation curve of linearizer needs and travelling-wave tubes is accordingly matched
Variation.
These linearizers are put when including travelling-wave tubes and solid-state power amplifier for power amplifier to improve power
The linearity of big device generates certain gain expansion and phase expansion, but these Linearization apparatus structures and method are unable to control its increasing
The frequency characteristic of benefit expansion and phase expansion, so that linearizer can only could obtain satisfied linearisation effect in very narrow frequency band
Fruit can not effectively linearize broad-band TWT.
In addition, there is parasitism in the diode used in these linearizer structures and methods, 3dB electric bridge, power splitter etc.
Effect, certain deterioration is brought to its frequency characteristic, further affects the effect of linearisation.Need to be improved amplitude and phase expansion
The non-linear frequency characteristic opened.
Summary of the invention
Non-linear inconsistent in frequency band to solve the problems, such as broad-band TWT, the present invention proposes a kind of for travelling-wave tubes function
The linearizer of rate amplifier predistortion, balanced device, which is added, can be convenient the frequency spy of adjustment linear branch and non-linear branch
Property, to generate the non-linear adjustable linearizer of dilation curve frequency characteristic, substantially improves linearizer and travelling-wave tubes is believed
Number linearisation bandwidth and effect.
A kind of the technical solution adopted by the present invention are as follows: linearizer for travelling-wave tubes power amplifier pre-distortion, comprising:
Input 3dB hybrid juction, output 3dB hybrid juction, linear branch and non-linear branch；Input 3dB hybrid juction first end
Connect input signal, input 3dB hybrid juction second end is connected with linear branch first end, input 3dB hybrid juction second end and
Non-linear branch first end is connected；Linear branch second end is connected with output 3dB hybrid juction first end, non-linear branch second
End is connected with output 3dB hybrid juction first end, exports output end of the 3dB hybrid juction second end as linearizer；
The linear branch includes the first balanced device, and the non-linear branch includes the second balanced device.
Further, linear branch further include: attenuator, the first group delay device, the first phase shifter；The attenuator first
The first end as linear branch is held, attenuator second end is connected with the first group delay device first end, the first group delay device second
End is connected with the first phase shifter first end, and the first phase shifter second end is connected with the first balanced device first end, the first balanced device the
Second end of two ends as linear branch.
Further, non-linear branch further include: nonlinear generator, the second group delay, the second phase shifter；It is described non-thread
Property first end of the generator first end as non-linear branch, the second end of nonlinear generator and the second group delay device first end
It is connected, the second group delay device second end is connected with the second phase shifter first end, the second phase shifter second end and the second balanced device phase
Even, the second balanced device second end is as non-linear branch second end.
Further, first balanced device includes: primary path, adjusts resistance and the first resonance microstrip line；Described
One resonance microstrip line is by adjusting on resistor coupled in parallel to primary path.
Further, first balanced device includes: primary path, adjusts resistance, the first resonance microstrip line, the second resonance
Microstrip line；The second resonance microstrip line first end is connected with the first resonance microstrip line first end, the first resonance microstrip line second
End is by adjusting on resistor coupled in parallel to primary path, the second resonance microstrip line second end ground connection.
Further, second balanced device includes: primary path, adjusts resistance and the first resonance microstrip line；Described
One resonance microstrip line is by adjusting on resistor coupled in parallel to primary path.
Further, second balanced device includes: primary path, adjusts resistance, the first resonance microstrip line, the second resonance
Microstrip line；The second resonance microstrip line first end is connected with the first resonance microstrip line first end, the first resonance microstrip line second
End is by adjusting on resistor coupled in parallel to primary path, the second resonance microstrip line second end ground connection.
Beneficial effects of the present invention: a kind of linearizer for travelling-wave tubes power amplifier pre-distortion of the invention leads to
Branch increasing degree balanced device and delayer above and below traditional two-way formula linearizer are crossed, the amplitude and phase for adjusting branch are poor
Meet certain requirement, makes to reach Broadband Matching travelling-wave tubes with travelling-wave tubes nonlinear curve Broadband Matching after two-way Vector modulation
Nonlinear optimization；Property device of the invention is utilized due to increasing the amplitude matching in balanced device adjustment linearizer frequency range
Time delay device adjusts the matching of the phase in entire frequency range；So that linearizer is generated more flexible adjustable nonlinear curve, can match
The broader travelling-wave tubes of bandwidth compensates non-linear can accurately adjust of travelling-wave tubes, is also applied for solid-state power amplifier
Linearisation.
Detailed description of the invention
Fig. 1 is pre-distortion linearizer functional block diagram of the present invention；
Fig. 2 is balanced device functional block diagram of the present invention；
Fig. 3 is the frequency characteristic figure of balanced device in the embodiment of the present invention；
Fig. 4 is another structural schematic diagram of balanced device in the embodiment of the present invention；
Fig. 5 is the structural schematic diagram of nonlinear generator in the embodiment of the present invention；
Wherein, 1 is input 3dB hybrid juction, and 2 be attenuator, and 3 be the first group delay device, and 4 be the first phase shifter, and 5 be the
One balanced device, 6 be nonlinear generator, and 7 be the second group delay device, and 8 be the second phase shifter, and 9 be the second balanced device, and 10 be output
3dB hybrid juction, 21 be the first build-out resistor, and 22 be the second build-out resistor, and 23 is adjust resistance, and 31 be the first resonance micro-strip
Line, 32 be the second resonance microstrip line.
Specific embodiment
Carry out the adjustable traveling wave tube linearizer and linearization technique described in the present invention will be described in detail with reference to the accompanying drawing.Such as
Shown in attached drawing 1, signal is divided into two-way, linear branch 11 and non-linear branch 12, linear branch by input 3dB hybrid juction 1
11 include: the first phase shifter 4, the first group delay device 3, attenuator 2 and the first balanced device 5；Non-linear branch 12 includes: non-linear
Generator 6, the second group delay device 7, the second phase shifter 8 and the second balanced device 9；Finally by output 3dB hybrid juction 8 will it is linear and
Non-linear two paths of signals Vector modulation.
Input signal reaches non-linear branch 12, and the nonlinear properties of predistortion are generated by nonlinear generator 6, are passed through
The amplitude difference of adjustable attenuator 2 the linear adjustment branch and non-linear branch of linear branch 11, the band of adjustable linearizer
Interior overall magnitude expansion and phase expansion.By the group delay device linear adjustment branch of linear branch and non-linear branch and non-thread
The time delay of property branch, the time delay matching degree of linear adjustment branch and non-linear branch.Pass through linear branch and non-linear branch
Phase shifter, the phase shift of linear branch and non-linear branch is adjusted, by adjusting the first balanced device 5 of linear branch 11 and non-thread
The amplitude-frequency characteristic of second balanced device 9 of property branch 12, mainly adjusts balanced device by resonance microstrip line 31 and resistance 23
Frequency characteristic.
Constitute linearizer input and output 3dB hybrid juction, can use branch line electric bridge, can also with Lange electric bridge,
Wilkson power splitter replaces.The selection of Lange electric bridge, branch line electric bridge and wilkson power splitter can be according to phase shifter phase shift
Range selects, in addition the selection of electric bridge and wilkson power splitter can provide 90 degree of phase shift range.
The embodiment one of balanced device 5 and 9 of the invention is as shown in Fig. 2, balanced device 5 and 9 is electric by build-out resistor 21, matching
Resistance 22 adjusts resistance 23 and resonance micro-strip 31 and forms, as shown in Fig. 2, wherein resonance microstrip line 31 by resistance 23 is parallel to master
On access, bell frequency characteristic is formed, as shown in figure 3, abscissa freq indicates frequency in Fig. 3, GHz is frequency unit；Fig. 3
Ordinate dB indicates gain.
The embodiment two of balanced device 5 and 9 of the invention is as shown in figure 4, the resonance micro-strip of balanced device can also be by two
The vibration microstrip line 31 and 32 of wiping of different rugosity and length forms, and resonance microstrip line 32 and 31 cascades, and the other end can be grounded, or series connection
Capacitor, diode ground connection.Although this mode resonance microstrip line is longer, adjustability is brought, with different capacitive loads, or
Biasing to varactor plus different voltages, adjusting resonance frequency that can be online optimize equalizer performance.
It can be used as a part for adjusting the nonlinear curve of control nonlinear generator, traditional line by waveform adjustment
Property device not can control the shape of nonlinear curve.
Signal passes through nonlinear generator 6 first in non-linear branch, and with the increase of signal power, signal is by non-
Line generator 6, due to the characteristic of Schottky diode, gain and phase shift become smaller, i.e. gain compression and phase-compression, generate
It is non-linear.
Nonlinear generator 6 is made of Schottky diode and micro-strip matching, as shown in figure 5, wherein Schottky diode
In parallel to be connect at non-linear branch by matching microstrip line, the Schottky diode can be single tube, or it is two-tube,
Two-tube connection type can be in the same direction, or reverse phase.
The phase shifter of linearizer can be constructed by varactor, and varactor is also to be associated on circuit, phase shift
Commercial chip composition can also be used in device.Attenuator is constructed by PIN diode, and PIN diode is also to be connected in parallel on circuit, phase shifter
4 or 8, nonlinear generator 6 and attenuator 2 form symmetrical structure with similar structure, linear branch and non-linear branch, lead to
The symmetrical structure is crossed, signal undergoes similar time delay.Diodes in parallel structure is utilized simultaneously, and time delay influences circuit
Less.
The differential phase shifter that linear branch and non-linear branch are made up of phase shifter 4 and 8, expands phase-adjusted model
It encloses.The 3dB hybrid juction of input and output simultaneously can also provide 90 degree of phase shift ranges using electric bridge or power splitter.
Those of ordinary skill in the art will understand that the embodiments described herein, which is to help reader, understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such specific embodiments and embodiments.For ability
For the technical staff in domain, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made
Any modification, equivalent substitution, improvement and etc. should be included within scope of the presently claimed invention.
Claims (7)
1. a kind of linearizer for travelling-wave tubes power amplifier pre-distortion characterized by comprising input 3dB mixing connects
Head, output 3dB hybrid juction, linear branch and non-linear branch；It inputs 3dB hybrid juction first and terminates input signal, it is defeated
Enter 3dB hybrid juction second end to be connected with linear branch first end, input 3dB hybrid juction second end and non-linear branch first
End is connected；Linear branch second end is connected with output 3dB hybrid juction first end, and non-linear branch second end and output 3dB are mixed
Splice grafting head first end is connected, and exports output end of the 3dB hybrid juction second end as linearizer；
The linear branch includes the first balanced device, and the non-linear branch includes the second balanced device.
2. a kind of linearizer for travelling-wave tubes power amplifier pre-distortion according to claim 1, which is characterized in that
Linear branch further include: attenuator, the first group delay device, the first phase shifter；The attenuator first end is as linear branch
First end, attenuator second end are connected with the first group delay device first end, the first group delay device second end and the first phase shifter the
One end is connected, and the first phase shifter second end is connected with the first balanced device first end, and the first balanced device second end is as linear branch
Second end.
3. a kind of linearizer for travelling-wave tubes power amplifier pre-distortion according to claim 2, which is characterized in that
Non-linear branch further include: nonlinear generator, the second group delay device, the second phase shifter；The nonlinear generator first end
As the first end of non-linear branch, the second end of nonlinear generator is connected with the second group delay device first end, at second groups
Prolong device second end to be connected with the second phase shifter first end, the second phase shifter second end is connected with the second balanced device, the second balanced device
Second end is as non-linear branch second end.
4. a kind of linearizer for travelling-wave tubes power amplifier pre-distortion according to claim 3, which is characterized in that
First balanced device includes: primary path, adjusts resistance and the first resonance microstrip line；The first resonance microstrip line passes through adjusting
On resistor coupled in parallel to primary path.
5. a kind of linearizer for travelling-wave tubes power amplifier pre-distortion according to claim 3, which is characterized in that
First balanced device includes: primary path, adjusts resistance, the first resonance microstrip line, the second resonance microstrip line；Second resonance
Microstrip line first end is connected with the first resonance microstrip line first end, and the first resonance microstrip line second end is arrived by adjusting resistor coupled in parallel
On primary path, the second resonance microstrip line second end ground connection.
6. a kind of linearizer for travelling-wave tubes power amplifier pre-distortion according to claim 4, which is characterized in that
Second balanced device includes: primary path, adjusts resistance and the first resonance microstrip line；The first resonance microstrip line passes through adjusting
On resistor coupled in parallel to primary path.
7. a kind of linearizer for travelling-wave tubes power amplifier pre-distortion according to claim 5, which is characterized in that
Second balanced device includes: primary path, adjusts resistance, the first resonance microstrip line, the second resonance microstrip line；Second resonance
Microstrip line first end is connected with the first resonance microstrip line first end, and the first resonance microstrip line second end is arrived by adjusting resistor coupled in parallel
On primary path, the second resonance microstrip line second end ground connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810999363.9A CN109150118A (en) | 2018-08-30 | 2018-08-30 | A kind of linearizer for travelling-wave tubes power amplifier pre-distortion |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810999363.9A CN109150118A (en) | 2018-08-30 | 2018-08-30 | A kind of linearizer for travelling-wave tubes power amplifier pre-distortion |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110309540A (en) * | 2019-05-30 | 2019-10-08 | 西安空间无线电技术研究所 | A kind of broadband linear device design method based on time delay matching technique |
| CN111293991A (en) * | 2020-03-17 | 2020-06-16 | 电子科技大学 | On-chip integrated broadband linearizer based on variable capacitor |
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| CN102160281A (en) * | 2008-09-10 | 2011-08-17 | 提赛特空间通信有限公司 | Predistortion linearizer with bridge topology having an equalizer stage for each bridge arm |
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| CN203883870U (en) * | 2014-04-04 | 2014-10-15 | 武汉凡谷电子技术股份有限公司 | Amplitude equalizer |
| CN105225906A (en) * | 2015-09-10 | 2016-01-06 | 电子科技大学 | A kind of miniaturized gainequalizer based on micro-imperfect structure |
| CN206993070U (en) * | 2017-07-07 | 2018-02-09 | 成都嘉晨科技有限公司 | A kind of microstrip line balanced device |
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- 2018-08-30 CN CN201810999363.9A patent/CN109150118A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080297245A1 (en) * | 2007-05-31 | 2008-12-04 | Andrew Corporation | Delay modulator pre-distortion circuit for an amplifier |
| CN102160281A (en) * | 2008-09-10 | 2011-08-17 | 提赛特空间通信有限公司 | Predistortion linearizer with bridge topology having an equalizer stage for each bridge arm |
| CN102545796A (en) * | 2012-02-15 | 2012-07-04 | 电子科技大学 | Traveling wave tube linearizer |
| CN203883870U (en) * | 2014-04-04 | 2014-10-15 | 武汉凡谷电子技术股份有限公司 | Amplitude equalizer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110309540A (en) * | 2019-05-30 | 2019-10-08 | 西安空间无线电技术研究所 | A kind of broadband linear device design method based on time delay matching technique |
| CN111293991A (en) * | 2020-03-17 | 2020-06-16 | 电子科技大学 | On-chip integrated broadband linearizer based on variable capacitor |
| CN111293991B (en) * | 2020-03-17 | 2023-03-31 | 电子科技大学 | On-chip integrated broadband linearizer based on variable capacitor |
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Application publication date: 20190104 |