CN112968675A - Pre-distortion Doherty power amplifier based on variable capacitance diode loading composite left-right-hand transmission line - Google Patents
Pre-distortion Doherty power amplifier based on variable capacitance diode loading composite left-right-hand transmission line Download PDFInfo
- Publication number
- CN112968675A CN112968675A CN202110141385.3A CN202110141385A CN112968675A CN 112968675 A CN112968675 A CN 112968675A CN 202110141385 A CN202110141385 A CN 202110141385A CN 112968675 A CN112968675 A CN 112968675A
- Authority
- CN
- China
- Prior art keywords
- power amplifier
- module
- transmission line
- output end
- varactor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
- H03F1/06—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators
- H03F1/07—Doherty-type amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Amplifiers (AREA)
Abstract
The invention relates to a predistortion Doherty power amplifier based on a variable capacitance diode loading composite left-right hand transmission line, which belongs to the field of microwave circuits and comprises a power divider, a predistortion module, a main power amplifier module, an auxiliary power amplifier module and a phase shift module; the input end of the power divider is a total input end, and the output end of the power divider is respectively connected with the input ends of the predistortion module and the main power amplification module; the output end of the predistortion module is connected with the input end of the auxiliary power amplification module; the output end of the main power amplifier module is connected with the phase shift module and then combined with the output end of the auxiliary power amplifier module to form a total output end. The invention can better compensate the gain compression characteristic of the auxiliary power amplifier, correct the phase distortion of the main power amplifier and the auxiliary power amplifier, flexibly improve the nonlinear distortion of the auxiliary power amplifier and realize the improvement of the linearity of the whole Doherty power amplifier.
Description
Technical Field
The invention belongs to the field of microwave circuits, and relates to a predistortion Doherty power amplifier based on a varactor loaded composite left-right hand transmission line.
Background
With the development and continuous progress of wireless communication, a multicarrier modulation method with a high peak-to-average power ratio is widely applied to a communication system, so the linearity of a power amplifier becomes more and more important, and in order to obtain higher linearity, methods such as power back-off, feed-forward, negative feedback, predistortion and the like are generally adopted, and the implementation of the three methods will result in lower efficiency or a complex structure of the power amplifier. The Doherty power amplifier has a simple structure, can obtain balance between efficiency and linearity indexes, and still needs to improve the linearity.
At present, in order to improve the linearity of the Doherty power amplifier, a scheme of applying a predistortion technology to the Doherty power amplifier is widely researched.
Disclosure of Invention
In view of the above, the present invention provides a predistortion doherty power amplifier based on a varactor loaded composite left-right-hand transmission line structure.
In order to achieve the purpose, the invention provides the following technical scheme:
a predistortion Doherty power amplifier based on a variable capacitance diode loading composite left-right hand transmission line comprises a power divider, a predistortion module, a main power amplifier module, an auxiliary power amplifier module and a phase shift module; the input end of the power divider is a total input end, and the output end of the power divider is respectively connected with the input ends of the predistortion module and the main power amplification module; the output end of the predistortion module is connected with the input end of the auxiliary power amplification module; the output end of the main power amplifier module is connected with the phase shift module and then combined with the output end of the auxiliary power amplifier module to form a total output end.
Further, the predistortion module comprises Schottky diodes D1, D2 and a varactor loaded composite left-right hand transmission line; the varactor loaded composite left-right hand transmission line comprises microstrip transmission lines T1, T2, capacitors C1 and C2, a varactor VD and an inductor L;
the output end of the power divider is sequentially connected in series with the capacitor C1, the microstrip transmission line T1, the capacitor T2, the capacitor C2 and the input end of the auxiliary power amplifier module, and the Schottky diode D1 is connected between the output end of the power divider and the capacitor C1; the variable capacitance diode VD is connected with the inductor L in series and is connected between the microstrip transmission line T1 and the microstrip transmission line T2; the Schottky diode D2 is connected between the capacitor C2 and the input end of the auxiliary power amplifier module;
forward bias voltages V1 and V2 are respectively applied to the Schottky diodes D1 and D2; the varactor VD is supplied with a reverse bias voltage V3.
Further, the power divider, the predistortion module, the main power amplifier module, the auxiliary power amplifier module and the phase shift module are arranged on a dielectric substrate, and the dielectric constant range of the dielectric substrate is 2-5.
Furthermore, the adjustable range of the DC bias voltage of the DC bias voltages V1, V2 and V3 is 0-12V.
Furthermore, the inductance value of the inductor L is 2.6nH, the length of the microstrip line T1 is L1, and the width of the microstrip line T1 is W1; the length of the microstrip line T2 is L2, and the width of the microstrip line T2 is W2; wherein L1-2.5 mm, L2-2.5 mm; w1-1.07 mm and W2-1.07 mm.
The invention has the beneficial effects that: the invention replaces 1/4 wavelength transmission lines before auxiliary power amplification in the traditional Doherty power amplifier with a predistortion module based on a varactor diode loaded composite left-hand and right-hand transmission line, and adjusts the capacitance value of the varactor diode by changing the direct current reverse bias voltage of the varactor diode, thereby changing the phase and characteristic impedance of the composite left-hand and right-hand transmission lines. Therefore, the phase distortion of the auxiliary power amplifier and the main power amplifier can be corrected by changing the direct current bias voltage of the variable capacitance diode; through the direct current bias who changes schottky diode and varactor, alright change the produced gain expansion curve of predistortion module, it is adjustable to realize the gain expansion curve, nimble gain compression characteristic phase-match with the auxiliary power amplifier of back level, the better nonlinear distortion who improves auxiliary power amplifier, and then whole doherty amplifier linearity has been improved, do not need other complicated circuits additionally, be applied to doherty power amplifier with predistortion technique, small, moreover, the steam generator is simple in structure, easily integrate with other microwave circuit, and the steam generator has very strong practicality and application prospect.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a circuit diagram of a pre-distorted Doherty power amplifier based on a varactor loaded composite left-right hand transmission line according to the present invention;
fig. 2 is a block diagram of the predistortion module.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
As shown in fig. 1, a predistortion doherty power amplifier based on varactor-loaded composite left-right hand transmission line is characterized in that: the power amplifier comprises an equal power divider 1, a predistortion module 2, a main power amplifier module 3, an auxiliary power amplifier module 4 and a phase shift module 5. The total input end of the doherty power amplifier corresponds to the input end of the equal power divider 1; the output end of the power divider 1 is respectively connected with the input ends of the predistortion module 2 and the main power amplifier module 3; the output end of the predistortion module 2 is connected with the input end of the auxiliary power amplifier module 4; the output end of the main power amplifier module 3 is combined with the output end of the auxiliary power amplifier module 4 through the phase shift module 5 to form a total output end. The invention replaces 1/4 wavelength transmission lines before the auxiliary power amplifier in the traditional Doherty power amplifier with a predistortion module based on a varactor diode loaded composite left-right hand transmission line, adjusts the capacitance value of the varactor diode by changing the direct current reverse bias voltage of the varactor diode, and further changes the phase and characteristic impedance of the composite left-right hand transmission line, so that the gain expansion curve generated by the predistortion module can be changed by changing the direct current bias voltage of the Schottky diode and the varactor diode, the gain expansion curve can be adjusted, the gain compression characteristic of the later-stage auxiliary power amplifier is flexibly matched, the nonlinear distortion of the auxiliary power amplifier is better improved, the linearity of the whole Doherty amplifier is improved, other complex circuits are not required to be added, the predistortion technology is applied to the Doherty power amplifier, the size is small, the structure is simple, and the like, Easy to integrate with other microwave circuits, and has strong practicability and application prospect.
As shown in fig. 2, the predistortion module 2 is composed of schottky diodes D1, D2 and varactor loaded composite right-left-hand transmission lines including microstrip transmission lines T1, T2; capacitors C1, C2; a variable diode VD and an inductor L. Adjustable direct current bias voltage is introduced into the Schottky diode and the variable capacitance diode.
The power divider, the predistortion module, the main power amplifier module, the auxiliary power amplifier module and the phase shift module of the Doherty power amplifier adopt plates Rogers4350, and the dielectric constant is 3.66. The inductance L is 2.6nH, and the capacitances of the capacitors C1 and C2 are 20pF and 20pF respectively; the dielectric constant range of the dielectric substrate is 2-5, and the loss tangent is less than or equal to 10-3(ii) a The varactor loaded composite left-right hand transmission line adopts a plate Rogers4350, and the microstrip line T1 has the length of L1 and the width of W1; the length of the microstrip line T2 is L2, and the width of the microstrip line T2 is W2. Wherein L1-2.5 mm, L2-2.5 mm; w1-1.07 mm and W2-1.07 mm.
The invention adjusts the capacitance value of the variable capacitance diode by changing the direct current reverse bias voltage of the variable capacitance diode, thereby realizing the change of the phase and the characteristic impedance of the composite left-right hand transmission line, and controlling the generation of a gain expansion curve by changing the direct current bias voltage on the Schottky diode and the variable capacitance diode, so that the gain compression characteristic of the post-stage auxiliary power amplifier is well compensated. Thereby improving the linearity of the whole power amplifier.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (5)
1. The utility model provides a predistortion doherty power amplifier based on varactor loading is compound about hand transmission line which characterized in that: the power amplifier comprises a power divider (1), a predistortion module (2), a main power amplifier module (3), an auxiliary power amplifier module (4) and a phase shift module (5); the input end of the power divider (1) is a total input end, and the output end of the power divider is respectively connected with the input ends of the predistortion module (2) and the main power amplifier module (3); the output end of the predistortion module (2) is connected with the input end of the auxiliary power amplifier module (4); the output end of the main power amplifier module (3) is connected with the phase shift module (5) and then combined with the output end of the auxiliary power amplifier module (4) to form a total output end.
2. The pre-distorted doherty power amplifier based on the varactor-loaded composite left-right hand transmission line according to claim 1, characterized in that: the predistortion module (2) comprises Schottky diodes D1 and D2 and a varactor loaded composite left-right hand transmission line; the varactor loaded composite left-right hand transmission line comprises microstrip transmission lines T1, T2, capacitors C1 and C2, a varactor VD and an inductor L;
the output end of the power divider (1) is sequentially connected with the capacitor C1, the microstrip transmission line T1, the capacitor T2, the capacitor C2 and the input end of the auxiliary power amplifier module (4) in series, and the Schottky diode D1 is connected between the output end of the power divider (1) and the capacitor C1; the variable capacitance diode VD is connected with the inductor L in series and is connected between the microstrip transmission line T1 and the microstrip transmission line T2; the Schottky diode D2 is connected between the capacitor C2 and the input end of the auxiliary power amplifier module (4);
forward bias voltages V1 and V2 are respectively applied to the Schottky diodes D1 and D2; the varactor VD is supplied with a reverse bias voltage V3.
3. The pre-distorted doherty power amplifier based on the varactor-loaded composite left-right hand transmission line according to claim 1, characterized in that: the power divider (1), the predistortion module (2), the main power amplifier module (3), the auxiliary power amplifier module (4) and the phase shift module (5) are arranged on a dielectric substrate, and the dielectric constant range of the dielectric substrate is 2-5.
4. The pre-distorted doherty power amplifier based on the varactor-loaded composite left-right hand transmission line according to claim 1, characterized in that: the adjustable range of the direct current bias voltage of the direct current bias voltages V1, V2 and V3 is 0-12V.
5. The pre-distorted doherty power amplifier based on the varactor-loaded composite left-right hand transmission line according to claim 1, characterized in that: the inductance value of the inductor L is 2.6nH, and the length of the microstrip line T1 is L1, and the width of the microstrip line T1 is W1; the length of the microstrip line T2 is L2, and the width of the microstrip line T2 is W2; wherein L1-2.5 mm, L2-2.5 mm; w1-1.07 mm and W2-1.07 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110141385.3A CN112968675A (en) | 2021-01-28 | 2021-01-28 | Pre-distortion Doherty power amplifier based on variable capacitance diode loading composite left-right-hand transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110141385.3A CN112968675A (en) | 2021-01-28 | 2021-01-28 | Pre-distortion Doherty power amplifier based on variable capacitance diode loading composite left-right-hand transmission line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112968675A true CN112968675A (en) | 2021-06-15 |
Family
ID=76273234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110141385.3A Pending CN112968675A (en) | 2021-01-28 | 2021-01-28 | Pre-distortion Doherty power amplifier based on variable capacitance diode loading composite left-right-hand transmission line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112968675A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114301400A (en) * | 2021-12-31 | 2022-04-08 | 重庆邮电大学 | 5G high-efficiency Doherty power amplifier based on varactor diode loading open-ended resonant ring |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6340917B1 (en) * | 1999-03-18 | 2002-01-22 | Alcatel | Broad frequency band linearization device |
| US20060220744A1 (en) * | 2005-03-31 | 2006-10-05 | Wong Gerald K | Doherty power amplifier with phase compensation |
| US20090295473A1 (en) * | 2008-05-28 | 2009-12-03 | Alexandre Dupuy | Power Amplifier Architectures |
| CN102290620A (en) * | 2011-06-03 | 2011-12-21 | 大连理工大学 | Electrically controlled adjustable phase shifter based on hybrid left/right-handed transmission line and ferroelectric material |
| CN102710220A (en) * | 2012-06-28 | 2012-10-03 | 武汉虹信通信技术有限责任公司 | Feed-forward power amplifier on basis of pre-distortion and Doherty |
| CN103560754A (en) * | 2013-11-18 | 2014-02-05 | 上海无线电设备研究所 | Compact microstrip resonant cell structure based high-linearity Doherty power amplifier |
| CN103840772A (en) * | 2013-12-03 | 2014-06-04 | 福建三元达通讯股份有限公司 | Circuit for improving Doherty power amplifier linearity by using CRLH-TL compensating line |
| CN103891137A (en) * | 2013-06-27 | 2014-06-25 | 华为技术有限公司 | Multi-frequency power amplifying device |
| CN104167994A (en) * | 2014-08-26 | 2014-11-26 | 电子科技大学 | Amplitude and phase tunable type pre-distortion linearizer |
| CN106656054A (en) * | 2016-10-14 | 2017-05-10 | 重庆邮电大学 | High-linearity Doherty power amplifier based on active non-Forster circuit |
| CN106788484A (en) * | 2016-11-16 | 2017-05-31 | 力同科技股份有限公司 | A kind of power amplifier |
| CN207603578U (en) * | 2017-12-25 | 2018-07-10 | 中国电子科技集团公司第五十四研究所 | Ka frequency range GaN power amplifier linearization devices based on analog predistortion |
| CN208572042U (en) * | 2018-07-28 | 2019-03-01 | 上海航天电子有限公司 | A kind of spaceborne miniaturization analog predistortion device |
-
2021
- 2021-01-28 CN CN202110141385.3A patent/CN112968675A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6340917B1 (en) * | 1999-03-18 | 2002-01-22 | Alcatel | Broad frequency band linearization device |
| US20060220744A1 (en) * | 2005-03-31 | 2006-10-05 | Wong Gerald K | Doherty power amplifier with phase compensation |
| US20090295473A1 (en) * | 2008-05-28 | 2009-12-03 | Alexandre Dupuy | Power Amplifier Architectures |
| TW201004138A (en) * | 2008-05-28 | 2010-01-16 | Rayspan Corp | Power amplifier architectures |
| CN102290620A (en) * | 2011-06-03 | 2011-12-21 | 大连理工大学 | Electrically controlled adjustable phase shifter based on hybrid left/right-handed transmission line and ferroelectric material |
| CN102710220A (en) * | 2012-06-28 | 2012-10-03 | 武汉虹信通信技术有限责任公司 | Feed-forward power amplifier on basis of pre-distortion and Doherty |
| CN103891137A (en) * | 2013-06-27 | 2014-06-25 | 华为技术有限公司 | Multi-frequency power amplifying device |
| CN103560754A (en) * | 2013-11-18 | 2014-02-05 | 上海无线电设备研究所 | Compact microstrip resonant cell structure based high-linearity Doherty power amplifier |
| CN103840772A (en) * | 2013-12-03 | 2014-06-04 | 福建三元达通讯股份有限公司 | Circuit for improving Doherty power amplifier linearity by using CRLH-TL compensating line |
| CN104167994A (en) * | 2014-08-26 | 2014-11-26 | 电子科技大学 | Amplitude and phase tunable type pre-distortion linearizer |
| CN106656054A (en) * | 2016-10-14 | 2017-05-10 | 重庆邮电大学 | High-linearity Doherty power amplifier based on active non-Forster circuit |
| CN106788484A (en) * | 2016-11-16 | 2017-05-31 | 力同科技股份有限公司 | A kind of power amplifier |
| CN207603578U (en) * | 2017-12-25 | 2018-07-10 | 中国电子科技集团公司第五十四研究所 | Ka frequency range GaN power amplifier linearization devices based on analog predistortion |
| CN208572042U (en) * | 2018-07-28 | 2019-03-01 | 上海航天电子有限公司 | A kind of spaceborne miniaturization analog predistortion device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114301400A (en) * | 2021-12-31 | 2022-04-08 | 重庆邮电大学 | 5G high-efficiency Doherty power amplifier based on varactor diode loading open-ended resonant ring |
| CN114301400B (en) * | 2021-12-31 | 2024-06-11 | 重庆邮电大学 | 5G high-efficiency doherty power amplifier based on varactor loaded split resonant ring |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7411449B2 (en) | Composite power amplifier | |
| CN100557948C (en) | The method and system that is used for amplifying signal | |
| US11171616B2 (en) | Multi-branch outphasing system and method | |
| US8957727B2 (en) | Asymmetric multilevel outphasing architecture for RF amplifiers | |
| CN104054260B (en) | DOHERTY power amplification device and method | |
| JP2003524988A (en) | Envelope tracking amplifier having improved gain, mobile communication terminal using the same, and gain improvement method therefor | |
| CN1434989A (en) | Antenna coupling systems and methods for transmitters | |
| CN100517960C (en) | Amplifier, and transmitter and communication device incorporating the same | |
| US8045939B2 (en) | Method for controlling a linear amplifier and power amplifier arrangement | |
| CN110011621B (en) | High-rollback range radio frequency power amplifier integrated with different directions and doherty structure | |
| CN112968675A (en) | Pre-distortion Doherty power amplifier based on variable capacitance diode loading composite left-right-hand transmission line | |
| CN101292420B (en) | Polar modulation apparatus and method using FM modulation | |
| CN108933569A (en) | A kind of broadband magnet coupled resonant type wireless electric energy transmission E power-like amplifier | |
| CN111342787A (en) | Load modulation differential power amplifier, base station and mobile terminal | |
| CN102035480B (en) | Power supply method and device and system for radio frequency power amplifier | |
| CN111682852A (en) | High-efficiency three-way doherty power amplifier based on power dividing ratio and phase-adjustable bridge | |
| Tom et al. | Load-pull analysis of outphasing class-E power amplifier | |
| Singhal et al. | A zero-voltage-switching contour-based outphasing power amplifier | |
| CN101036289B (en) | Analog predistorter and its regulation method and method for compensating signal change | |
| KR20200094535A (en) | Doherty power amplifier and the method of modulating load impedance of the amplifier | |
| CN112448677A (en) | Doherty power amplifier structure with large bandwidth and compact structure | |
| Lepine et al. | A load modulated high efficiency power amplifier | |
| CN114362693B (en) | Alternating current small signal driving radio frequency microwave amplifier | |
| CN108259009A (en) | A kind of multi-stage, efficient power amplifier | |
| CN113659938B (en) | Analog predistorter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210615 |