CN103840772A - Circuit for improving Doherty power amplifier linearity by using CRLH-TL compensating line - Google Patents
Circuit for improving Doherty power amplifier linearity by using CRLH-TL compensating line Download PDFInfo
- Publication number
- CN103840772A CN103840772A CN201310642197.4A CN201310642197A CN103840772A CN 103840772 A CN103840772 A CN 103840772A CN 201310642197 A CN201310642197 A CN 201310642197A CN 103840772 A CN103840772 A CN 103840772A
- Authority
- CN
- China
- Prior art keywords
- power amplifier
- transmission line
- crlh
- connects
- compensating wire
- 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
Landscapes
- Amplifiers (AREA)
Abstract
The invention provides a circuit for improving Doherty power amplifier linearity by using a CRLH-TL compensating line. One output end of a power divider U1 is connected with the input end of a main power amplifier A1, the output end of the main power amplifier A1 is connected with the input end of the CRLH-TL compensating line, the output end of the CRLH-TL compensating line is connected with one end of a lambda/4 transmission line TL2, the other output end of the power divider U1 is connected with one end of a lambda/4 transmission line TL1, another end of the lambda/4 transmission line TL1 is connected with the input end of a peak power amplifier A2, and the output end of the peak power amplifier A2 is connected with the another end of the lambda/4 transmission line TL2 and one end of a lambda/4 transmission line TL3. The circuit for improving Doherty power amplifier linearity by using the CRLH-TL compensating line is simple, low in cost and good in linearity and solves the problem that cost is high when an existing Doherty power amplifier is high in linearity.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of circuit of the CRLH-TL of use compensating wire raising Doherty power amplifier linearity.
Background technology
Modern wireless communication systems is to realize higher message transmission rate and spectrum efficiency, has adopted widely linearity modulation technique, has improved the performance requirement of radio-frequency power amplifier.For example CDMA, WCDMA, LTE system have strict requirement to the linearity, and therefore, many power amplifiers are usually operated in larger rollback state.Traditional rollback power amplification efficiency is lower, if rollback 10dB left and right will cause lower efficiency.Be to adopt Doherty power amplifier in order to raise the efficiency major part, but the peak value power amplifier in Doherty power amplifier (being auxiliary power amplifier) is operated in C class, so will produce high-order crosstalk, the linearity is very poor.The method that realizes high linearity power amplifier is a lot, for example, and predistortion and feedforward etc., but these methods need to be used complicated additional circuit with signal processing, and this,, by causing the complexity of design and the raising of cost, is restricted linearizing raising.
Summary of the invention
The technical problem to be solved in the present invention, is to provide a kind of CRLH-TL of use compensating wire to improve the circuit of Doherty power amplifier linearity.The high problem of cost while solving existing Doherty power amplifier high linearity.
The present invention is achieved in that
Use CRLH-TL compensating wire to improve a circuit for Doherty power amplifier linearity, comprise power divider U1, main power amplifier A1, peak value power amplifier A2, λ/4 transmission line TL1, λ/4 transmission line TL2, λ/4 transmission line TL3 and CRLH-TL compensating wire;
An output of described power divider U1 connects the input of described main power amplifier A1, the output of described main power amplifier A1 connects the input of described CRLH-TL compensating wire, the output of described CRLH-TL compensating wire connects one end of λ/4 transmission line TL2, another output of described power divider U1 connects one end of λ/4 transmission line TL1, the other end of described λ/4 transmission line TL1 connects the input of peak value power amplifier A2, and the output of described peak value power amplifier A2 connects the other end and transmission line TL3 one end, λ/4 of λ/4 transmission line TL2.
Further, described CRLH-TL compensating wire comprises variable voltage source and variable capacitance diode P1, and described variable voltage source is for controlling the anti-phase bias voltage of variable capacitance diode P1.
Further, described CRLH-TL compensating wire also comprises inductance L 1, capacitor C 1, capacitor C 2, transmission line TL4 and transmission line TL5, one end of described capacitor C 1 connects the output of main power amplifier A1, the other end of described capacitor C 1 connects one end of transmission line TL4, the other end of transmission line TL4 connects one end of inductance L 1 and one end of transmission line TL5, the other end of described inductance L 1 connects anode the ground connection of variable capacitance diode P1, the negative terminal of described variable capacitance diode P1 is connected with the positive pole of variable voltage source, the other end of described transmission line TL5 connects one end of capacitor C 2, one end of the other end of described capacitor C 2 and λ/4 transmission line TL2.
Tool of the present invention has the following advantages: do not increasing on the basis of size, can realize the good linearity at lower and higher-wattage, circuit is simple, has reduced cost.
Brief description of the drawings
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the circuit diagram of the preferred embodiment of the present invention.
Embodiment
Refer to shown in Fig. 1, below the present invention is described in detail.
CRLH-TL:Composite Right/left-handed Transmission Line is composite right/left-handed transmission line, according to traditional right hand transmission line, in conjunction with the transport property structure composite right/left-handed transmission line of left-handed materials.
As shown in Figure 1, the invention provides the circuit that a kind of CRLH-TL of use compensating wire improves Doherty power amplifier linearity, comprise power divider U1, main power amplifier A1, peak value power amplifier A2, λ/4 transmission line TL1, λ/4 transmission line TL2, λ/4 transmission line TL3 and CRLH-TL compensating wire 1.
An output of power divider U1 connects the input of described main power amplifier A1, main power amplifier A1
Output connect the input of described CRLH-TL compensating wire 1, the output of CRLH-TL compensating wire 1 connects one end of λ/4 transmission line TL2, another output of power divider U1 connects one end of λ/4 transmission line TL1, the other end of λ/4 transmission line TL1 connects the input of peak value power amplifier A2, and the output of peak value power amplifier A2 connects the other end and transmission line TL3 one end, λ/4 of λ/4 transmission line TL2.
In application in the present invention, because being C class, amplifies peak value power amplifier A2, so in high power situation, can produce larger third order intermodulation phase distortion and second harmonic phase distortion, the phase characteristic at different frequency by CRLH-TL compensating wire 1 is different, adjust electric capacity, inductance value, can obtain difference arbitrarily, CRLH-TL compensating wire 1 has just compensated third order intermodulation phase distortion and second harmonic phase distortion like this, make the power amplifier A1 of winner with 180 ° of the second harmonic phase phasic differences of peak value power amplifier A2, can be good at balancing out, improve again the phase distortion of Doherty power amplifier simultaneously, thereby improve the linearity of Doherty power amplifier.CRLH-TL compensating wire 1 has multiple implementation in the prior art, CRLH-TL compensating wire 1 has ensured that the phase place when fundamental frequency (f) is-90 °, and phase place when second harmonic (2f) is-180 °, so most of second harmonic is cancelled at synthetic output (being the output of peak value power amplifier A2), therefore, the phase distortion of whole Doherty power amplifier and the linearity will be by larger improves.
Preferably, CRLH-TL compensating wire 1 comprises variable voltage source 2 and variable capacitance diode P1, and variable voltage source 2 is for controlling the anti-phase bias voltage of variable capacitance diode P1.Use variable capacitance diode P1 in the time of the anti-phase bias voltage of difference, to there is the characteristic of different capacitances, can change the capacitance of variable capacitance diode P1 by controlling the output voltage of variable voltage source 2, changed the capacitance of CRLH-TL compensating wire 1, adjust the output phase of CRLH-TL compensating wire 1, making output and the main power amplifier A1 of peak value power amplifier A2 is 180 ° at the second harmonic phase difference of the other end of λ/4 transmission line TL2, thereby improve better the phase distortion of Doherty power amplifier, also improved the linearity of Doherty power amplifier.
When concrete CRLH-TL compensating wire 1 is realized, also comprise inductance L 1, capacitor C 1, capacitor C 2, transmission line TL4 and transmission line TL5, one end of described capacitor C 1 connects the output of main power amplifier A1, the other end of described capacitor C 1 connects one end of transmission line TL4, the other end of transmission line TL4 connects one end of inductance L 1 and one end of transmission line TL5, the other end of inductance L 1 connects anode the ground connection of variable capacitance diode P1, the negative terminal of variable capacitance diode P1 is connected with the positive pole of variable voltage source 2, the other end of described transmission line TL5 connects one end of capacitor C 2, one end of the other end of described capacitor C 2 and λ/4 transmission line TL2.
Foregoing circuit is in low-power situation, and peak value power amplifier A2 closes, the third order intermodulation (IMD3) of whole Doherty power amplifier, only provided by main power amplifier A1, the phase distortion of traditional Doherty power amplifier is almost identical with this circuit, because CRLH-TL compensating wire 1 has suppressed the harmonic component of power amplifier, therefore
AM-AM distortion is less than traditional Doherty power amplifier.Simultaneously in high power situation, A2 is open-minded for peak value power amplifier, the third order intermodulation of whole Doherty power amplifier is provided by main power amplifier A1 and auxiliary power amplifier A2 simultaneously, and their distortion can reduce by adjusting CRLH-TL compensating wire 1, and practical application can improve the effect of third order intermodulation preferably.
Although more than described the specific embodiment of the present invention; but being familiar with those skilled in the art is to be understood that; our described specific embodiment is illustrative; instead of for the restriction to scope of the present invention; those of ordinary skill in the art are in equivalent modification and the variation done according to spirit of the present invention, all should be encompassed in the scope that claim of the present invention protects.
Claims (3)
1. use CRLH-TL compensating wire to improve a circuit for Doherty power amplifier linearity, it is characterized in that: comprise power divider U1, main power amplifier A1, peak value power amplifier A2, λ/4 transmission line TL1, λ/4 transmission line TL2, λ/4 transmission line TL3 and CRLH-TL compensating wire;
An output of described power divider U1 connects the input of described main power amplifier A1, the output of described main power amplifier A1 connects the input of described CRLH-TL compensating wire, the output of described CRLH-TL compensating wire connects one end of λ/4 transmission line TL2, another output of described power divider U1 connects one end of λ/4 transmission line TL1, the other end of described λ/4 transmission line TL1 connects the input of peak value power amplifier A2, and the output of described peak value power amplifier A2 connects the other end and transmission line TL3 one end, λ/4 of λ/4 transmission line TL2.
2. a kind of circuit that uses CRLH-TL compensating wire to improve Doherty power amplifier linearity according to claim 1, it is characterized in that: described CRLH-TL compensating wire comprises variable voltage source and variable capacitance diode P1, described variable voltage source is for controlling the anti-phase bias voltage of variable capacitance diode P1.
3. a kind of circuit that uses CRLH-TL compensating wire to improve Doherty power amplifier linearity according to claim 2, it is characterized in that: described CRLH-TL compensating wire also comprises inductance L 1, capacitor C 1, capacitor C 2, transmission line TL4 and transmission line TL5, one end of described capacitor C 1 connects the output of main power amplifier A1, the other end of described capacitor C 1 connects one end of transmission line TL4, the other end of transmission line TL4 connects one end of inductance L 1 and one end of transmission line TL5, the other end of described inductance L 1 connects anode the ground connection of variable capacitance diode P1, the negative terminal of described variable capacitance diode P1 is connected with the positive pole of variable voltage source, the other end of described transmission line TL5 connects one end of capacitor C 2, one end of the other end of described capacitor C 2 and λ/4 transmission line TL2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310642197.4A CN103840772A (en) | 2013-12-03 | 2013-12-03 | Circuit for improving Doherty power amplifier linearity by using CRLH-TL compensating line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310642197.4A CN103840772A (en) | 2013-12-03 | 2013-12-03 | Circuit for improving Doherty power amplifier linearity by using CRLH-TL compensating line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103840772A true CN103840772A (en) | 2014-06-04 |
Family
ID=50803976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310642197.4A Pending CN103840772A (en) | 2013-12-03 | 2013-12-03 | Circuit for improving Doherty power amplifier linearity by using CRLH-TL compensating line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103840772A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104518742A (en) * | 2014-12-10 | 2015-04-15 | 天津大学 | High-efficiency double-frequency band F-type power amplifier |
| CN104993796A (en) * | 2015-06-25 | 2015-10-21 | 江苏大学 | Doherty power amplifier |
| CN107493081A (en) * | 2017-06-27 | 2017-12-19 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Use the Doherty power amplifier of the compound left/right hand transmission line lifting bandwidth of broadband type |
| CN110212930A (en) * | 2019-05-29 | 2019-09-06 | 维沃移动通信有限公司 | Radio circuit and terminal |
| CN112968675A (en) * | 2021-01-28 | 2021-06-15 | 重庆邮电大学 | Pre-distortion Doherty power amplifier based on variable capacitance diode loading composite left-right-hand transmission line |
-
2013
- 2013-12-03 CN CN201310642197.4A patent/CN103840772A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104518742A (en) * | 2014-12-10 | 2015-04-15 | 天津大学 | High-efficiency double-frequency band F-type power amplifier |
| CN104518742B (en) * | 2014-12-10 | 2018-02-23 | 天津大学 | A kind of high-efficiency double-frequency band F power-like amplifiers |
| CN104993796A (en) * | 2015-06-25 | 2015-10-21 | 江苏大学 | Doherty power amplifier |
| CN104993796B (en) * | 2015-06-25 | 2018-03-27 | 江苏大学 | A kind of Doherty power amplifier |
| CN107493081A (en) * | 2017-06-27 | 2017-12-19 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Use the Doherty power amplifier of the compound left/right hand transmission line lifting bandwidth of broadband type |
| CN107493081B (en) * | 2017-06-27 | 2020-08-18 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Doherty power amplifier for improving bandwidth by using broadband type composite left/right-handed transmission line |
| CN110212930A (en) * | 2019-05-29 | 2019-09-06 | 维沃移动通信有限公司 | Radio circuit and terminal |
| CN112968675A (en) * | 2021-01-28 | 2021-06-15 | 重庆邮电大学 | Pre-distortion Doherty power amplifier based on variable capacitance diode loading composite left-right-hand transmission line |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107425814B (en) | Broadband Doherty power amplifier based on compensation parasitic capacitance | |
| US8988147B2 (en) | Multi-way Doherty amplifier | |
| CN106301238B (en) | A kind of high-power high-efficiency Doherty power amplifier | |
| CN107547050A (en) | A kind of twin-stage double frequency-band high efficiency power amplifier | |
| CN107863939B (en) | Low-power consumption feedback type power amplifying circuit | |
| US20140218116A1 (en) | Power Amplifier Apparatus and Power Amplifier Circuit | |
| CN103840772A (en) | Circuit for improving Doherty power amplifier linearity by using CRLH-TL compensating line | |
| CN103117711A (en) | Monolithic integrated radio frequency high-gain low-noise amplifier | |
| CN111510076B (en) | class-AB driven Doherty power amplifier, base station and mobile terminal | |
| CN104167994A (en) | Amplitude and phase tunable type pre-distortion linearizer | |
| CN110708029B (en) | Dual-band different-direction power amplifier based on unequal-length transmission line and design method thereof | |
| CN105450185A (en) | Reconfigurable high-efficiency high-linearity broadband power amplifying method and amplifier | |
| CN214256246U (en) | Novel Doherty power amplifier with rear matching structure | |
| CN106374860A (en) | Doherty power amplifier based on voltage synthesis structure | |
| CN203734624U (en) | High-performance microstrip multistage low-noise amplifier | |
| EP2704317A1 (en) | Power amplifier device and power amplifier circuit | |
| Yang et al. | 26.5 A watt-level quadrature switched/floated-capacitor power amplifier with back-off efficiency enhancement in complex domain using reconfigurable self-coupling canceling transformer | |
| CN101888214A (en) | Cascode power amplifier with improved efficiency and linearity | |
| CN203632621U (en) | Circuit for improving Doherty power amplification linearity by CRLH-TL (composite right/left-handed transmission line) compensating line | |
| CN108763640B (en) | High-efficiency and high-back-off Doherty power amplifier and design method thereof | |
| Ledezma | Doherty power amplifier with lumped non-foster impedance inverter | |
| Piazzon et al. | A method for designing broadband Doherty power amplifiers | |
| CN106505901B (en) | A kind of linear-resonance combined type hyperfrequency inverter | |
| CN205304743U (en) | High linear broad band power amplifier of restructural high efficiency | |
| CN212649423U (en) | Novel Doherty power amplifier based on rear matching structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140604 |