CN102545796A - Traveling wave tube linearizer - Google Patents
Traveling wave tube linearizer Download PDFInfo
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- CN102545796A CN102545796A CN2012100335985A CN201210033598A CN102545796A CN 102545796 A CN102545796 A CN 102545796A CN 2012100335985 A CN2012100335985 A CN 2012100335985A CN 201210033598 A CN201210033598 A CN 201210033598A CN 102545796 A CN102545796 A CN 102545796A
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Abstract
The invention discloses a traveling wave tube linearizer, which comprises a first hybrid junction, a second hybrid junction, a linear branch and a nonlinear branch. A radio frequency input signal is divided into two paths by the first hybrid junction, and the two paths are recorded as a first branch of signals and a second branch of signals. The first and second branches of signals are input into the linear branch and the nonlinear branch respectively. Output signals of the linear branch and the nonlinear branch are coupled into a radio frequency output signal by the second hybrid junction. The traveling wave tube linearizer has a simple structure; and the curve of the linearizer can be regulated by regulating amplitude expansion, phase expansion and the waveform of a nonlinear generator, and then the linearizer is matched with the characteristics of different traveling wave tube power amplifiers to linearize the different traveling wave tube power amplifiers, so that the problems of nonlinear differences among different traveling wave tubes are solved.
Description
Technical field
The invention belongs to the power amplifier technical field, be specifically related to a kind of travelling wave tube linearizer.
Technical background
Along with mobile communication technology develops rapidly; It is more and more crowded that wireless communication frequency band becomes; Frequency spectrum resource is more and more nervous; In order in limited spectral range, to hold more communication channel, people have proposed the modulation system (M-QAM etc.) of some wideband digital transmission technologys (OFDM, WCDMA etc.) and high spectrum utilization.Adopt the signal that these technology are transmitted to have characteristics such as non-constant envelope, broadband and high peak-to-average ratio; After modulation signal is through nonlinear power amplifier, will produce in the band and out-of-band distortion; Cause the output signal spectrum expansion; The out-of-band distortion signal disturbs adjacent channel, and the inband distortion signal increases the communication system error rate.For the quality that guarantees to communicate by letter, Modern Communication System has proposed very high requirement to the linearity of radio-frequency power amplifier, requires power amplifier to have the good linearity, higher efficient and higher power output.In order to guarantee above index simultaneously, except adopting high efficiency power amplifier structure, the power amplifier linearization The Application of Technology also becomes inevitable.The power amplifier linearization technology has become one of key technology of next generation wireless communication system.In the modern communication system, the travelling wave tube power amplifier has obtained using widely, owing to the reason of technology; Especially domestic travelling wave tube; Travelling wave tube is different with nonlinear characteristic between the travelling wave tube, need carry out different linearizer customizations to different travelling wave tube is non-linear by conventional way, and cost is very high; Therefore be necessary to design a kind of adjustable linearizer, with the linearisation of the travelling wave tube that is applicable to different qualities.
Power amplifier linearization technology commonly used has back-off method, feed forward approach, negative feedback method and pre-distortion technology etc.The back-off method is traditional and effective a kind of method, yet the rollback of working point has reduced the power utilization efficient of power amplifier and caused very high heat dissipation; Feed forward approach can obtain effect preferably in the bandwidth of broad, be a kind of linearization technique of present comparative maturity, but its shortcoming low and system complex that is efficient; The negative feedback method is to exchange the linearity for gain, and its narrow bandwidth and stability problem have limited its application; Pre-distortion technology is divided into analog predistortion technology and digital pre-distortion technology again; Advantages such as that digital pre-distortion technology has is stable, efficient, wide bandwidth and self adaptation; Moderate linearisation can be reached, but the occasion that input and output are all radiofrequency signal can not be applied to.Analog predistortion especially the radio frequency analog pre-distortion linearizer have that volume is little, cost is low, circuit realize simple, in advantages such as microwave and millimeter wave frequency range absolute bandwidth are big, and can obtain suitable linearisation effect.
Chinese invention patent CN101567667A discloses a kind of enhancement type analog predistortion linear power amplifier, but said analog predistortion linear power amplifier is used for the WCDMA mobile communication, and frequency range is lower, can not be used for the Ku wave band.Chinese invention patent CN1396707A discloses the distortion compensating method of a kind of predistortion linearizer and predistortion; Program and medium; But said predistortion linearizer is the communication base station that is used for the mobile unit of portable phone steps on lower frequency range, can not be used for the higher Ku frequency range of frequency.Chinese invention patent CN101807886A discloses a kind of radio frequency power amplifying device and analog predistortion correction method thereof.Said analog predistortion correction method is based on the lower occasion of 3G (Third Generation) Moblie technology equifrequent, can not be used for the application of Ku wave band.And for the above pre-distortion linearizer, most of circuit structure more complicated is unfavorable for the miniaturization and low-cost design of linearisation RF power amplification.
Summary of the invention
The objective of the invention is to have proposed a kind of travelling wave tube linearizer in order to solve existing predistortion linear power amplifier complex structure and can not to carry out linearizing problem to the travelling-wave tube amplifier of different qualities.
Technical scheme of the present invention is: a kind of travelling wave tube linearizer; Comprise: first hybrid junction, second hybrid junction, linear branch and non-linear branch; Radio-frequency input signals is divided into two-way through first hybrid junction; Be designated as first tributary signal and second tributary signal, first tributary signal and second tributary signal are input to described linear branch and non-linear branch respectively, and the output signal of linear branch and non-linear branch is coupled into radio frequency output signal through second hybrid junction.
Said linear branch comprises first attenuator, the first group delay unit and first phase shifter; First tributary signal is successively through first attenuator, the first group delay unit and first phase shifter; Wherein, First attenuator is used for the amplitude of conditioning signal, and the first group delay unit is used for the time delay of conditioning signal, and first phase shifter is used for the phase place of conditioning signal;
Said non-linear branch comprises first nonlinear generator, the second group delay unit and second phase shifter; Second tributary signal is successively through first nonlinear generator, the second group delay unit and second phase shifter; Wherein, First nonlinear generator is used to make second tributary signal to produce gain compression and phase place compression, produces the nonlinear distortion signal; The second group delay unit is used to regulate the time delay of the nonlinear distortion signal of generation; Second phase shifter is used to regulate the phase place through the signal after the second group delay unit.
Beneficial effect of the present invention: travelling wave tube linearizer of the present invention simple in structure; Can be through the waveform of adjusting range expansion, phase place expansion and nonlinear generator; The curve of adjustment linearizer matches the characteristic of different travelling wave tube power amplifiers with linearizer, is used for the different travelling-wave tube amplifier of linearisation; Solved the problem of the non-linear difference between the different rows wave duct; Travelling wave tube linearizer with adjustable carries out linearisation to different travelling-wave tube amplifiers, reduces cost, and accelerates debugging and produces the accent phase.The invention provides that a kind of circuit structure is simple, volume is little, be applicable to the analog predistortion linear device of upper frequency application scenarios such as Ku wave band.
Description of drawings
Fig. 1 is the structural representation of travelling wave tube linearizer of the present invention.
Fig. 2 is the structural representation of first nonlinear generator in the embodiment of the invention.
Fig. 3 is another structural representation of first nonlinear generator in the embodiment of the invention.
Fig. 4 is the structural representation of phase shifter in the embodiment of the invention.
Fig. 5 is an attenuator structural representation in the embodiment of the invention.
Fig. 6 is another structural representation of attenuator in the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and concrete embodiment the present invention is done further elaboration.
The structural representation of travelling wave tube linearizer of the present invention is as shown in Figure 1; Comprise: first hybrid junction, second hybrid junction, linear branch and non-linear branch; Radio-frequency input signals is divided into two-way through first hybrid junction; Be designated as first tributary signal and second tributary signal, first tributary signal and second tributary signal are input to described linear branch and non-linear branch respectively, and the output signal of linear branch and non-linear branch is coupled into radio frequency output signal through the second hybrid junction vector.
Here; Said linear branch comprises first attenuator, the first group delay unit and first phase shifter; First tributary signal is successively through first attenuator, the first group delay unit and first phase shifter, and wherein, first attenuator is used for the amplitude of conditioning signal; The first group delay unit is used for the time delay of conditioning signal, and first phase shifter is used for the phase place of conditioning signal;
Here; Said non-linear branch comprises first nonlinear generator, the second group delay unit and second phase shifter; Second tributary signal is successively through first nonlinear generator, the second group delay unit and second phase shifter; Wherein, first nonlinear generator is used to make second tributary signal to produce gain compression and phase place compression, produces the nonlinear distortion signal; The second group delay unit is used to regulate the time delay of the nonlinear distortion signal of generation; Second phase shifter is used to regulate the phase place through the signal after the second group delay unit.
Through the amplitude of the first attenuator linear adjustment branch road, thus the amplitude difference of linear adjustment branch road and non-linear branch, and the amplitude of regulating whole linearizer output characteristic curve is expanded and the effect of phase place expansion thereby reach.
Time delay matching degree through the first group delay unit and the second group delay unit linear adjustment branch road and non-linear branch.
Through regulating first phase shifter and second phase shifter; The phase shift of linear adjustment branch road and non-linear branch; Can make linear branch and non-linear branch reach Optimum Matching, simultaneously can anti-phase regulate the amplitude expansion of whole travelling wave tube linearizer output characteristic curve and expand with phase place.
Through regulating the first DC feedback unit (when adopting scheme as shown in Figure 2) in first nonlinear generator; Perhaps through regulating the second DC feedback unit (when adopting scheme as shown in Figure 3) in first nonlinear generator; The non-linear point of adjustment nonlinear generator, the waveform of adjusting nonlinear generator.
Here, first hybrid junction and second hybrid junction are the 3dB hybrid junction, can use the branch line electric bridge, also can use the Wilkinson power splitter to replace.
Here; First nonlinear generator is as shown in Figure 2; Said first nonlinear generator is made up of the first microstrip line unit, the second microstrip line unit, the 3rd microstrip line unit, the first DC feedback unit and first Schottky diode; The said first microstrip line unit and second microstrip line are unit cascaded, and the said first DC feedback unit also is connected on the said first microstrip line unit, said the 3rd microstrip line unit and be connected in the said first microstrip line unit and the said second microstrip line unit in the middle of; Said first Schottky diode and said the 3rd microstrip line are unit cascaded, the other end ground connection of first Schottky diode.
Schottky diode can be single tube, also can be for two-tube, and two-tube connected mode can be in the same way, also can be for oppositely.
First nonlinear generator also can be made up of three-dB coupler and two Schottky diodes, and is as shown in Figure 3.Said first nonlinear generator is made up of the 4th microstrip line unit, the 5th microstrip line unit, first three-dB coupler, second Schottky diode, the 3rd Schottky diode, the second DC feedback unit; Said the 4th microstrip line unit links to each other with the input of first three-dB coupler; Said the 5th microstrip line unit links to each other with the isolation end of first three-dB coupler; Said second Schottky diode links to each other with the other two ends of first three-dB coupler respectively with the 3rd Schottky diode; The other end ground connection of second Schottky diode and the 3rd Schottky diode, the said second DC feedback unit also is connected on the 4th microstrip line unit.
In non-linear branch, second tributary signal is at first through first nonlinear generator, because the characteristic of Schottky diode, along with the increase of signal power, its gain and phase shift diminish, and produce the compression of gain compression and phase place, promptly produce non-linear.
Here, first phase shifter and second phase shifter adopt the HMC247 of HITTITE company.
First phase shifter and second phase shifter also can be made up by variable capacitance diode, and be as shown in Figure 4.The schematic diagram of said first phase shifter and second phase shifter is compared with nonlinear generator as shown in Figure 3, and except Schottky diode is changed into the variable capacitance diode, other element and annexation are identical.
Be specially: said phase shifter is made up of the 6th microstrip line unit, the 7th microstrip line unit, second three-dB coupler, first variable capacitance diode, second variable capacitance diode, the 3rd DC feedback unit; Said the 6th microstrip line unit links to each other with the input of second three-dB coupler; Said the 7th microstrip line unit links to each other with the isolation end of second three-dB coupler; Said first variable capacitance diode links to each other with the other two ends of second three-dB coupler respectively with second variable capacitance diode; The other end ground connection of first variable capacitance diode and second variable capacitance diode, said the 3rd DC feedback unit also is connected on the 6th microstrip line unit.
Here; First attenuator is made up by single PIN diode, and is as shown in Figure 5, and the schematic diagram of said first attenuator is compared with nonlinear generator as shown in Figure 2; Except Schottky diode is changed into the PIN diode, other element and annexation are identical.
Be specially: said first attenuator is made up of the 8th microstrip line unit, the 9th microstrip line unit, the tenth microstrip line unit, the 4th DC feedback unit and first PIN diode; Said the 8th microstrip line unit and the 9th microstrip line are unit cascaded; Said the 4th DC feedback unit also is connected on said the 8th microstrip line unit; Said the tenth microstrip line unit and be connected in said the 8th microstrip line unit and said the 9th microstrip line unit in the middle of; Said first PIN diode and said the tenth microstrip line are unit cascaded, the other end ground connection of first PIN diode.
First attenuator also can be made up of three-dB coupler and two PIN diodes, and is as shown in Figure 6.The schematic diagram of said first attenuator is compared with nonlinear generator as shown in Figure 3, and except Schottky diode is changed into the PIN diode, other element and annexation are identical.
Be specially: said nonlinear generator is made up of the 11 microstrip line unit, the 12 microstrip line unit, the 3rd three-dB coupler, second PIN diode, the 3rd PIN diode, the 5th DC feedback unit; Said the 11 microstrip line unit links to each other with the input of the 3rd three-dB coupler; Said the 12 microstrip line unit links to each other with the isolation end of the 3rd three-dB coupler; Said second PIN diode links to each other with the other two ends of the 3rd three-dB coupler respectively with the 3rd PIN diode; The other end ground connection of second PIN diode and the 3rd PIN diode, said the 5th DC feedback unit also is connected on the 11 microstrip line unit.
First phase shifter and second phase shifter adopt similar structure; First attenuator and first nonlinear generator adopt similar structure, and linear branch and non-linear branch form symmetrical structure like this, through symmetrical structure; Signal experiences similar time delay; Through first phase shifter and second phase shifter, constitute the differential phase shifter of linear branch and non-linear branch, enlarge phase-adjusted scope; First nonlinear generator is adjustable nonlinear generator, can regulate the nonlinear characteristic curve of nonlinear generator, and traditional linearizer can not be regulated the shape of nonlinear curve.
Those of ordinary skill in the art will appreciate that embodiment described here is in order to help reader understanding's principle of the present invention, should to be understood that protection scope of the present invention is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not break away from essence of the present invention according to these teachings disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (10)
1. travelling wave tube linearizer; It is characterized in that; Comprise: first hybrid junction, second hybrid junction, linear branch and non-linear branch, radio-frequency input signals is divided into two-way through first hybrid junction, is designated as first tributary signal and second tributary signal; First tributary signal and second tributary signal are input to described linear branch and non-linear branch respectively, and the output signal of linear branch and non-linear branch is coupled into radio frequency output signal through second hybrid junction.
2. travelling wave tube linearizer according to claim 1; It is characterized in that said linear branch comprises first attenuator, the first group delay unit and first phase shifter, first tributary signal is successively through first attenuator, the first group delay unit and first phase shifter; Wherein, First attenuator is used for the amplitude of conditioning signal, and the first group delay unit is used for the time delay of conditioning signal, and first phase shifter is used for the phase place of conditioning signal;
Said non-linear branch comprises first nonlinear generator, the second group delay unit and second phase shifter; Second tributary signal is successively through first nonlinear generator, the second group delay unit and second phase shifter; Wherein, First nonlinear generator is used to make second tributary signal to produce gain compression and phase place compression, produces the nonlinear distortion signal; The second group delay unit is used to regulate the time delay of the nonlinear distortion signal of generation; Second phase shifter is used to regulate the phase place through the signal after the second group delay unit.
3. travelling wave tube linearizer according to claim 2 is characterized in that, described first hybrid junction and second hybrid junction are the 3dB hybrid junction.
4. travelling wave tube linearizer according to claim 2; It is characterized in that; Said first nonlinear generator is made up of the first microstrip line unit, the second microstrip line unit, the 3rd microstrip line unit, the first DC feedback unit and first Schottky diode; The said first microstrip line unit and second microstrip line are unit cascaded, and the said first DC feedback unit also is connected on the said first microstrip line unit, said the 3rd microstrip line unit and be connected in the said first microstrip line unit and the said second microstrip line unit in the middle of; Said first Schottky diode and said the 3rd microstrip line are unit cascaded, the other end ground connection of first Schottky diode.
5. travelling wave tube linearizer according to claim 2; It is characterized in that; Said first nonlinear generator is made up of the 4th microstrip line unit, the 5th microstrip line unit, first three-dB coupler, second Schottky diode, the 3rd Schottky diode, the second DC feedback unit; Said the 4th microstrip line unit links to each other with the input of first three-dB coupler; Said the 5th microstrip line unit links to each other with the isolation end of first three-dB coupler; Said second Schottky diode links to each other with the other two ends of first three-dB coupler respectively with the 3rd Schottky diode, the other end ground connection of second Schottky diode and the 3rd Schottky diode, and the said second DC feedback unit also is connected on the 4th microstrip line unit.
6. travelling wave tube linearizer according to claim 2; It is characterized in that; Said phase shifter is made up of the 6th microstrip line unit, the 7th microstrip line unit, second three-dB coupler, first variable capacitance diode, second variable capacitance diode, the 3rd DC feedback unit; Said the 6th microstrip line unit links to each other with the input of second three-dB coupler; Said the 7th microstrip line unit links to each other with the isolation end of second three-dB coupler; Said first variable capacitance diode links to each other with the other two ends of second three-dB coupler respectively with second variable capacitance diode, the other end ground connection of first variable capacitance diode and second variable capacitance diode, and said the 3rd DC feedback unit also is connected on the 6th microstrip line unit.
7. travelling wave tube linearizer according to claim 2; It is characterized in that; Said first attenuator is made up of the 8th microstrip line unit, the 9th microstrip line unit, the tenth microstrip line unit, the 4th DC feedback unit and first PIN diode; Said the 8th microstrip line unit and the 9th microstrip line are unit cascaded, and said the 4th DC feedback unit also is connected on said the 8th microstrip line unit, said the tenth microstrip line unit and be connected in said the 8th microstrip line unit and said the 9th microstrip line unit in the middle of; Said first PIN diode and said the tenth microstrip line are unit cascaded, the other end ground connection of first PIN diode.
8. travelling wave tube linearizer according to claim 2; It is characterized in that; Said nonlinear generator is made up of the 11 microstrip line unit, the 12 microstrip line unit, the 3rd three-dB coupler, second PIN diode, the 3rd PIN diode, the 5th DC feedback unit; Said the 11 microstrip line unit links to each other with the input of the 3rd three-dB coupler; Said the 12 microstrip line unit links to each other with the isolation end of the 3rd three-dB coupler; Said second PIN diode links to each other with the other two ends of the 3rd three-dB coupler respectively with the 3rd PIN diode, the other end ground connection of second PIN diode and the 3rd PIN diode, and said the 5th DC feedback unit also is connected on the 11 microstrip line unit.
9. travelling wave tube linearizer according to claim 4 is characterized in that, said Schottky diode is a single tube or two-tube.
10. travelling wave tube linearizer according to claim 9 is characterized in that, said two-tube connected mode is in the same way or oppositely.
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| CN201210033598.5A CN102545796B (en) | 2012-02-15 | 2012-02-15 | Traveling wave tube linearizer |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103414435A (en) * | 2013-06-24 | 2013-11-27 | 中国电子科技集团公司第十研究所 | Predistortion linearization device of millimeter wave power amplifier |
| CN105897191A (en) * | 2016-05-24 | 2016-08-24 | 中国科学院电子学研究所 | Predistortion linearizer and application of the predistortion linearizer |
| CN109150118A (en) * | 2018-08-30 | 2019-01-04 | 电子科技大学 | A kind of linearizer for travelling-wave tubes power amplifier pre-distortion |
| CN109391237A (en) * | 2018-09-30 | 2019-02-26 | 西安空间无线电技术研究所 | Linearizer and its adjusting method for travelling-wave tubes power amplifier pre-distortion |
| CN109740225A (en) * | 2018-12-25 | 2019-05-10 | 电子科技大学 | A method of it calculates and assesses for broad-band TWT |
| CN112019181A (en) * | 2020-07-17 | 2020-12-01 | 中国人民解放军战略支援部队信息工程大学 | Design method of extremely-high-frequency broadband linearizer |
| CN112054978A (en) * | 2020-08-10 | 2020-12-08 | 超讯通信股份有限公司 | Double-branch analog predistortion system |
| CN113114124A (en) * | 2021-04-09 | 2021-07-13 | 中国电子科技集团公司第十二研究所 | Broadband adjustable linearizer of space traveling wave tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103414435A (en) * | 2013-06-24 | 2013-11-27 | 中国电子科技集团公司第十研究所 | Predistortion linearization device of millimeter wave power amplifier |
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| CN109150118A (en) * | 2018-08-30 | 2019-01-04 | 电子科技大学 | A kind of linearizer for travelling-wave tubes power amplifier pre-distortion |
| CN109391237A (en) * | 2018-09-30 | 2019-02-26 | 西安空间无线电技术研究所 | Linearizer and its adjusting method for travelling-wave tubes power amplifier pre-distortion |
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| CN112019181A (en) * | 2020-07-17 | 2020-12-01 | 中国人民解放军战略支援部队信息工程大学 | Design method of extremely-high-frequency broadband linearizer |
| CN112019181B (en) * | 2020-07-17 | 2023-03-28 | 中国人民解放军战略支援部队信息工程大学 | Design method of extremely-high-frequency broadband linearizer |
| CN112054978A (en) * | 2020-08-10 | 2020-12-08 | 超讯通信股份有限公司 | Double-branch analog predistortion system |
| CN113114124A (en) * | 2021-04-09 | 2021-07-13 | 中国电子科技集团公司第十二研究所 | Broadband adjustable linearizer of space traveling wave tube |
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