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1. CN1473395 - System for closed loop power control using linear or non-linear power amplifier

Office
China
Application Number 01818350.6
Application Date 17.08.2001
Publication Number 1473395
Publication Date 04.02.2004
Grant Number 1210874
Grant Date 13.07.2005
Publication Kind C
IPC
H03G 3/10
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
GCONTROL OF AMPLIFICATION
3Gain control in amplifiers or frequency changers
02Manually-operated control
04in untuned amplifiers
10having semiconductor devices
H04B 1/04
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/-H04B13/123; Details of transmission systems not characterised by the medium used for transmission
02Transmitters
04Circuits
CPC
H03F 1/02
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
1Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
02Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
H03F 2200/294
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
2200Indexing scheme relating to amplifiers
294the amplifier being a low noise amplifier [LNA]
H03F 2200/372
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
2200Indexing scheme relating to amplifiers
372Noise reduction and elimination in amplifier
H03G 3/3042
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
GCONTROL OF AMPLIFICATION
3Gain control in amplifiers or frequency changers ; without distortion of the input signal
20Automatic control
30in amplifiers having semiconductor devices
3036in high-frequency amplifiers or in frequency-changers
3042in modulators, frequency-changers, transmitters or power amplifiers
H04W 52/52
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
52Power management, e.g. TPC [Transmission Power Control], power saving or power classes
04TPC
52using AGC [Automatic Gain Control] circuits or amplifiers
H04B 1/04
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
02Transmitters
04Circuits
Applicants Conexant Systems, Inc.
天工方案公司
Inventors M. Damgaard
莫腾·达姆高
D. Rozenblit
德米特里·罗森布利特
W.J. Domino
威廉·J·多米诺
里克·W·克拉克
Agents xia jing
永新专利商标代理有限公司
Priority Data 09650987 30.08.2000 US
Title
(EN) System for closed loop power control using linear or non-linear power amplifier
(ZH) 采用线性或非线性功率放大器的闭环功率控制系统
Abstract
(EN)
A system for a closed power control feedback loop allows for the use of a non-linear amplifier for amplifying a phase modulated (PM) signal while introducing an inverse version of the desired amplitude modulation (AM) signal into the feedback loop using a variable gain element. By introducing an inverse version of the desired AM portion of the signal into the power control feedback loop, the non-linear, and highly efficient, power amplifier may be used to amplify only the PM portion of the signal, while the AM portion is introduced by the power control feedback loop. In another aspect of the invention, an inverse version of the AM portion of the desired transmit signal is introduced into the power control feedback loop of an amplifier that is amplifying both a phase modulated signal and an amplitude modulated signal. By introducing an inverse version of the desired AM signal into the power control feedback loop, the power control feedback loop may not cancel the AM component present at the output of the power amplifier. In yet another aspect of the invention, the desired AM signal is injected into the feedback loop along with the power control reference signal.

(ZH)

一种闭合功率控制反馈环系统,它便于采用非线性放大器放大相位调制(PM)信号,同时使用可变增益元件将期望的幅度调制(AM)信号的反相信号引入反馈环。通过将期望的信号AM部分的反相信号引入功率控制反馈环,可以使用高效的非线性功率放大器只对信号的PM部分进行放大,同时由功率控制反馈环引入AM部分。在本发明另一方案中,将期望的发射信号的AM部分的反相信号引入放大器的功率控制反馈环,该放大器放大相位调制信号和幅度调制信号。通过将期望的AM信号的反相信号引入功率控制反馈环,功率控制反馈环可不必去除功率放大器的输出端出现的AM分量。在本发明的又一方案中,期望的AM信号与功率控制参考信号一同被引入反馈环。