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1. WO1996004710 - FEEDFORWARD AMPLIFIER FOR MINIMIZING DISTORTION

Publication Number WO/1996/004710
Publication Date 15.02.1996
International Application No. PCT/US1995/007374
International Filing Date 07.06.1995
IPC
H03F 1/02 2006.01
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 1/32 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
1Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
32Modifications of amplifiers to reduce non-linear distortion
CPC
H03F 1/0288
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
0205in transistor amplifiers
0288using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers
H03F 1/3235
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
1Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
32Modifications of amplifiers to reduce non-linear distortion
3223using feed-forward
3229using a loop for error extraction and another loop for error subtraction
3235using a pilot signal
H03F 2201/3218
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
2201Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by H03F1/00
32Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion
3218the main amplifier or error amplifier being a feedforward amplifier
Applicants
  • MOTOROLA INC. [US/US]; 1303 East Algonquin Road Schaumburg, IL 60196, US
Inventors
  • MITZLAFF, James, Edward; US
Agents
  • BUFORD, Kevin, A. ; Motorola Inc. Intellectual Property Dept. 1303 East Algonquin Road Schaumburg, IL 60196, US
Priority Data
08/282,29829.07.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) FEEDFORWARD AMPLIFIER FOR MINIMIZING DISTORTION
(FR) AMPLIFICATEUR A ACTION ANTICIPEE POUR UNE REDUCTION DES DISTORSIONS AU MINIMUM
Abstract
(EN)
A feedforward distortion minimization circuit includes a first loop with an input splitter (305) and first and second signal paths, each signal path having an amplifier (316, 334). An output combiner (335) couples the two signal paths and has an output signal path and an output dump load path. A first signal detector (336) on the dump load path detects a dump load signal, and in response a gain and phase controller (350) operates to adjust the gain and phase of a first signal on one of two signal paths to minimize the power delivered to the dump load (338). The feedforward circuit also includes embodiments in which both amplifiers operate at around the same power amplification level, and in which a second loop has an error amplifier (362) for further distortion correction.
(FR)
Circuit d'atténuation de distortion par action anticipée, comprenant une première boucle dotée d'un diviseur d'entrée (305) et d'une première et deuxième voie de signaux, chaque voie comportant un amplificateur (316, 334). Un combineur de sortie (335), qui relie les deux voies de signaux, comprend une voie de sortie de signaux et une voie de vidage de sortie. Un premier détecteur de signaux (336) sur la voie de vidage détecte un signal de vidage et, en réponse, un régulateur de gain et de phase (350) intervient pour régler le gain et la phase d'un premier signal sur l'une des deux voies de signaux, de manière à réduire au minimum la puissance appliquée au vidage (338). Le circuit à action anticipée revêt également des configurations selon lesquelles les deux amplificateurs fonctionnent sensiblement au même niveau d'amplification de puissance et une deuxième boucle comporte un amplificateur d'erreur (362) permettant de corriger encore la distorsion.
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