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1. CA2420687 - SYSTEM FOR CLOSED LOOP POWER CONTROL USING A LINEAR OR A NON-LINEAR POWER AMPLIFIER

Office
Canada
Application Number 2420687
Application Date 17.08.2001
Publication Number 2420687
Publication Date 07.03.2002
Publication Kind A1
IPC
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
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 3/66
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
3Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
66Amplifiers simultaneously generating oscillations of one frequency and amplifying signals of another frequency
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
H03G 3/30
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
GCONTROL OF AMPLIFICATION
3Gain control in amplifiers or frequency changers
20Automatic control
30in amplifiers having semiconductor devices
H04B 7/005
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
005Control of transmission; Equalising
CPC
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
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
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
Applicants CONEXANT SYSTEMS, INC.
Inventors DAMGAARD, MORTEN
ROZENBLIT, DMITRIY
DOMINO, WILLIAM J.
CLARK, RICKE W.
Priority Data 09650987 30.08.2000 US
Title
(EN) SYSTEM FOR CLOSED LOOP POWER CONTROL USING A LINEAR OR A NON-LINEAR POWER AMPLIFIER
(FR) SYSTEME POUR LA REGULATION DE PUISSANCE D'UNE BOUCLE FERMEE A L'AIDE D'UN AMPLIFICATEUR DE PUISSANCE LINEAIRE OU NON LINEAIRE
Abstract
(EN)
A system for a closed power control feedback loop (200) 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 (Fig. 2, block 212). 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 (200). 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 with the power control reference signal.