CN102437819A - Large dynamic cascade Doherty power amplifier - Google Patents
Large dynamic cascade Doherty power amplifier Download PDFInfo
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- CN102437819A CN102437819A CN2011104583212A CN201110458321A CN102437819A CN 102437819 A CN102437819 A CN 102437819A CN 2011104583212 A CN2011104583212 A CN 2011104583212A CN 201110458321 A CN201110458321 A CN 201110458321A CN 102437819 A CN102437819 A CN 102437819A
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- power amplifier
- doherty power
- port
- output
- diverter switch
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Abstract
The invention relates to a large dynamic cascade Doherty power amplifier. The large dynamic cascade Doherty power amplifier comprises a driving Doherty power amplifier, a switch S1, a final Doherty power amplifier, a switch S2, a coupler, a circulator and configuration software, wherein the driving Doherty power amplifier and the final Doherty power amplifier together form Doherty power amplifier cascade; a port 1 of the switch S1 is connected with the output end of the driving Doherty power amplifier, and a port 3 of the switch S1 is connected with the input end of the final Doherty power amplifier; a port 1 of the switch S2 is connected with the input end of the coupler, and a port 3 of the switch S2 is connected with the output end of the final Doherty power amplifier; a port 2 of the switch S1 is connected with a port 2 of the switch S2; and the output end of the coupler is connected with the input end of the circulator. The large dynamic cascade Doherty power amplifier has the characteristics of a simple structure and improved efficiency.
Description
Technical field
The high efficiency transmitter system that the present invention relates to communicate by letter, particularly a kind of big dynamic cascading Doherty power amplifier.
Background technology
The main at present main power amplifier that adopts the Doherty power amplifier as transmitter in wireless base station and repeater; The Doherty power amplifier can only obtain best efficient in the rollback point of its design; For (being that the power output rollback is very big) under the big dynamic need situation of power output, its efficient can worsen a lot.The present invention proposes under a kind of big dynamic power output condition; Through switching and to the method for reshuffling the efficient that improves power amplifier system of the voltage of the drain electrode of power amplifier and grid; Big dynamic cascading Doherty power amplifier of the present invention can keep higher efficient in the power output dynamic range of 12dB; With respect to the direct rollback technology of the Doherty of routine, 6～10 percentage points improved efficiency can be arranged.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned existence, and a kind of simple in structure, big dynamic cascading Doherty power amplifier that efficient is high is provided.
The objective of the invention is to accomplish through following technical scheme, it comprises and drives Doherty power amplifier, S1 diverter switch, final stage Doherty power amplifier, S2 diverter switch, coupler, circulator, configuration software; Described driving Doherty power amplifier and final stage Doherty power amplifier form the cascade of Doherty power amplifier jointly; The port one of described S1 diverter switch links to each other with the output that drives the Doherty power amplifier, and the port 3 of S1 diverter switch links to each other with the input of final stage Doherty power amplifier; The port one of described S2 diverter switch links to each other with the input of coupler, and the port 3 of S2 diverter switch links to each other with the output of final stage Doherty power amplifier; The port 2 of S1 diverter switch links to each other with the port 2 of S2 diverter switch; The output of described coupler links to each other with the input of circulator.
As preferably, the ratio of the optimum output power between described driving Doherty power amplifier and final stage Doherty power amplifier is 1:4.
As preferably; In power output is design maximum power and rollback 6dB maximum power scope: drive the input of Doherty power amplifier output as final stage Doherty power amplifier; The port one of S1 diverter switch links to each other with port 3, and the port one of S2 diverter switch links to each other with port 3.
As preferably; After power output ratio design maximum power is less than 6dB: drive the output of the output of Doherty amplifier as final stage Doherty power amplifier; The port one of S1 diverter switch is connected with port 2; The port one of S2 diverter switch is connected with port 2, and the output that promptly drives the Doherty power amplifier directly is connected with coupler, and final stage Doherty power amplifier is no longer worked.
Beneficial effect of the present invention is: to comparing with existing Doherty power amplifier; The present invention proposes a kind of under big dynamic power output condition; Through switching and to the method for reshuffling the efficient that improves power amplifier system of the voltage of the drain electrode of power amplifier and grid; Described big dynamic cascading Doherty power amplifier can keep higher efficient in the power output dynamic range of 12dB; With respect to the direct rollback technology of the Doherty of routine, 6～10 percentage points improved efficiency can be arranged.
Description of drawings
Fig. 1 is the system block diagram of the big dynamic cascading Doherty of the present invention power amplifier.
Fig. 2 is the sketch map of power output of the present invention for design maximum power and rollback 6dB maximum power scope internal power amplifier system.
Fig. 3 is that power output of the present invention is for needing the power tube drain voltage and the grid voltage sketch map of configuration in design maximum power and the rollback 6dB maximum power scope.
Fig. 4 be power output of the present invention than the design maximum power less than 6dB after the realization sketch map of power amplifier system.
Fig. 5 be power output of the present invention than the design maximum power less than 6dB after power amplifier system the power tube drain voltage and the grid voltage sketch map that need dispose.
Label in the accompanying drawing is respectively: 1, drive the Doherty power amplifier, 2, the S1 diverter switch, 3, final stage Doherty power amplifier, 4, the S2 diverter switch, 5, coupler, 6, circulator, 7, configuration software.
Embodiment
To combine accompanying drawing that the present invention is done detailed introduction below:
Shown in accompanying drawing 1, the present invention includes and drive Doherty power amplifier 1, S1 diverter switch 2, final stage Doherty power amplifier 3, S2 diverter switch 4, coupler 5, circulator 6, configuration software 7; Described driving Doherty power amplifier 1 and the 3 common formation Doherty power amplifier cascades of final stage Doherty power amplifier; The port one of described S1 diverter switch 2 links to each other with the output that drives Doherty power amplifier 1, and the port 3 of S1 diverter switch 2 links to each other with the input of final stage Doherty power amplifier 3; The port one of described S2 diverter switch 4 links to each other with the input of coupler 5, and the port 3 of S2 diverter switch 4 links to each other with the output of final stage Doherty power amplifier 3; The port 2 of S1 diverter switch 2 links to each other with the port 2 of S2 diverter switch 4; The output of described coupler 5 links to each other with the input of circulator 6.
The ratio of the optimum output power that described driving Doherty power amplifier 1 and final stage Doherty power amplifier are 3 is 1:4.
Shown in accompanying drawing 2; In power output is design maximum power and rollback 6dB maximum power scope: drive the input of Doherty power amplifier 1 output as final stage Doherty power amplifier 3; The port one of S1 diverter switch 2 links to each other with port 3, and the port one of S2 diverter switch 4 links to each other with port 3.
Shown in accompanying drawing 4; After power output ratio design maximum power is less than 6dB: drive the output of the output of Doherty amplifier 1 as final stage Doherty power amplifier 3; The port one of S1 diverter switch 2 is connected with port 2; The port one of S2 diverter switch 4 is connected with port 2, and the output that promptly drives the Doherty power amplifier directly is connected with coupler 5, and final stage Doherty power amplifier 3 is no longer worked.
Shown in accompanying drawing 3, in the peak power output and rollback 6dB scope of power amplifier system power output, according to the characteristic of Doherty power amplifier for design; Only under the condition of maximum design power power output; Final stage Doherty power amplifier 3 just has best efficient, and along with the rollback of power output, the efficient of final stage Doherty power amplifier 3 can significantly worsen; For this reason; Among the present invention, reduce the drain voltage Vd1 of the power transistor that reduces final stage Doherty simultaneously, Vd2 through configuration software 7; Among the present invention, to the LDMOS power tube, drain voltage is decline 1V along with the every decline 1dB of power output; Because drain voltage descends, this moment, the performance of Doherty power amplifier changed, and needed this moment through adjustment power tube grid voltage Vg1; Vg2 optimizes the performance of Doherty power amplifier, and the foundation of improvement is the AM-AM (amplitude-amplitude) of Doherty power amplifier, AM-PM (amplitude-phase place) compression curve; These are according to AM-AM, AM-PM curve and predefined leakage is pressed, and the grid voltage respective value is to be pre-stored among the Flash; Along with leaking the variation of pressing, configuration software 7 calls corresponding grid voltage value.Vd3 is pressed in the leakage that drives Doherty power amplifier 1, Vd4 and grid voltage Vg3, and Vg4 remains unchanged.
Shown in accompanying drawing 5, drive Doherty power amplifier 1 and can only under the power output condition of design maximum power rollback 6dB, obtain best efficient, but the power output of power amplifier system is when continuing rollback, power amplifier system efficient will worsen.This moment must be to driving the drain voltage Vd3 of Doherty power amplifier 1 system, and Vd4, grid voltage Vg3, Vg4 carry out new being configured to and keep best efficient; For this reason, among the present invention, to the LDMOS power tube, drain voltage Vd3; Vd4 is decline 1V along with the every decline 1dB of power output, because drain voltage descends, this moment, the performance of Doherty power amplifier changed; Need this moment through adjustment power tube grid voltage Vg3, Vg4 optimizes the performance of Doherty power amplifier, and the foundation of improvement is the AM-AM (amplitude-amplitude) of Doherty power amplifier; AM-PM (amplitude-phase place) compression curve, these are according to AM-AM, AM-PM curve and predefined leakage is pressed; The grid voltage respective value is to be pre-stored among the Flash to get, and along with leaking the variation of pressing, configuration software 7 calls corresponding grid voltage value.
Satisfy driving Doherty amplifier 1 operating state along with the different output power demand of said process, final stage Doherty power amplifier 3 operating state, S1 diverter switch 2, the switching state of S2 diverter switch 4.To the control of power tube, all drop on the protection range of requirement of the present invention in the Doherty power amplifier switching of the big dynamically power output that all employings are equal to and the switching engineering.
Claims (4)
1. one kind big dynamic cascading Doherty power amplifier is characterized in that: comprise driving Doherty power amplifier (1), S1 diverter switch (2), final stage Doherty power amplifier (3), S2 diverter switch (4), coupler (5), circulator (6), configuration software (7); Described driving Doherty power amplifier (1) and final stage Doherty power amplifier (3) form the cascade of Doherty power amplifier jointly; The port one of described S1 diverter switch (2) links to each other with the output that drives Doherty power amplifier (1), and the port 3 of S1 diverter switch (2) links to each other with the input of final stage Doherty power amplifier (3); The port one of described S2 diverter switch (4) links to each other with the input of coupler (5), and the port 3 of S2 diverter switch (4) links to each other with the output of final stage Doherty power amplifier (3); The port 2 of S1 diverter switch (2) links to each other with the port 2 of S2 diverter switch (4); The output of described coupler (5) links to each other with the input of circulator (6).
2. big dynamic cascading Doherty power amplifier according to claim 1 is characterized in that: the ratio of the optimum output power between described driving Doherty power amplifier (1) and final stage Doherty power amplifier (3) is 1:4.
3. big dynamic cascading Doherty power amplifier according to claim 1; It is characterized in that: in power output is design maximum power and rollback 6dB maximum power scope: drive the input of Doherty power amplifier (1) output as final stage Doherty power amplifier (3); The port one of S1 diverter switch (2) links to each other with port 3, and the port one of S2 diverter switch (4) links to each other with port 3.
4. big dynamic cascading Doherty power amplifier according to claim 1; It is characterized in that: after power output ratio design maximum power is less than 6dB: drive the output of the output of Doherty amplifier (1) as final stage Doherty power amplifier (3); The port one of S1 diverter switch (2) is connected with port 2; The port one of S2 diverter switch (4) is connected with port 2; The output that promptly drives the Doherty power amplifier directly is connected with coupler (5), and final stage Doherty power amplifier (3) is no longer worked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104583212A CN102437819A (en) | 2011-12-31 | 2011-12-31 | Large dynamic cascade Doherty power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104583212A CN102437819A (en) | 2011-12-31 | 2011-12-31 | Large dynamic cascade Doherty power amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN102437819A true CN102437819A (en) | 2012-05-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104583212A Pending CN102437819A (en) | 2011-12-31 | 2011-12-31 | Large dynamic cascade Doherty power amplifier |
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| Country | Link |
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| CN (1) | CN102437819A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110720240A (en) * | 2017-06-12 | 2020-01-21 | 华为技术有限公司 | Method and device for reducing power consumption of PA |
| CN113474992A (en) * | 2019-01-20 | 2021-10-01 | Iad信息自动化及数据处理有限公司 | Transmission and reception device with a wideband HF power amplifier, in particular an N-way Doherty amplifier with active load modulation |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1742428A (en) * | 2003-01-03 | 2006-03-01 | 维弗克斯株式会社 | High efficiency power amplification apparatus with multiple power mode |
| CN101350599A (en) * | 2008-08-25 | 2009-01-21 | 华为技术有限公司 | Method, apparatus and base station for amplifying power |
| CN102185565A (en) * | 2011-04-29 | 2011-09-14 | 中兴通讯股份有限公司 | Power amplifier and power amplifier circuit |
| CN102291347A (en) * | 2011-09-02 | 2011-12-21 | 大唐移动通信设备有限公司 | DPD (Digital Pre-Distortion) processing method and equipment based on multiband spectrum |
| CN202475369U (en) * | 2011-12-31 | 2012-10-03 | 三维通信股份有限公司 | Large dynamic cascade doherty power amplifier |
-
2011
- 2011-12-31 CN CN2011104583212A patent/CN102437819A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1742428A (en) * | 2003-01-03 | 2006-03-01 | 维弗克斯株式会社 | High efficiency power amplification apparatus with multiple power mode |
| CN101350599A (en) * | 2008-08-25 | 2009-01-21 | 华为技术有限公司 | Method, apparatus and base station for amplifying power |
| CN102185565A (en) * | 2011-04-29 | 2011-09-14 | 中兴通讯股份有限公司 | Power amplifier and power amplifier circuit |
| CN102291347A (en) * | 2011-09-02 | 2011-12-21 | 大唐移动通信设备有限公司 | DPD (Digital Pre-Distortion) processing method and equipment based on multiband spectrum |
| CN202475369U (en) * | 2011-12-31 | 2012-10-03 | 三维通信股份有限公司 | Large dynamic cascade doherty power amplifier |
Non-Patent Citations (1)
| Title |
|---|
| 郑青: "Doherty功率放大器的研究", 《CNKI》, 21 August 2009 (2009-08-21) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110720240A (en) * | 2017-06-12 | 2020-01-21 | 华为技术有限公司 | Method and device for reducing power consumption of PA |
| CN110720240B (en) * | 2017-06-12 | 2022-09-23 | 华为技术有限公司 | Method and device for reducing power consumption of PA |
| CN113474992A (en) * | 2019-01-20 | 2021-10-01 | Iad信息自动化及数据处理有限公司 | Transmission and reception device with a wideband HF power amplifier, in particular an N-way Doherty amplifier with active load modulation |
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Application publication date: 20120502 |