Amplificateur à contre-réaction de type aval

Feedforward amplifier

Vorwärtskopplungsverstärker

Abstract

In a first step, a control circuit (61) operates a switch (63) to detect both the frequency of an input signal which is input to an input terminal (1) and any distortion generated by amplification of this input signal or mixed in, and sets the frequency of a pilot signal output from a variable frequency oscillator (62) at a value other than the input signal frequency and the frequency of the distortion and close to an average value of the input signal. Thereafter, the control circuit (61) closes the switch (63) and controls a distortion detecting loop (7) by using the pilot signal in a second step and controls a distortion removing loop (4) in a third step. In a fourth step, it succeeds the control of the distortion removing loop (4) in a normal state and controls the distortion detecting loop (7) again only when environment as detected by a sensor (64), is significantly changed.

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Patent Citations (3)

    Publication numberPublication dateAssigneeTitle
    EP-0367457-A2May 09, 1990AT&T Corp.A feed forward linear amplifier
    EP-0466123-A1January 15, 1992Nippon Telegraph And Telephone Corporation, Ntt Mobile Communications Network Inc.Vorwärtsgekoppelter Verstärker
    EP-0557929-A1September 01, 1993Japan Radio Co., Ltd, Nippon Telegraph And Telephone Corporation, Ntt Mobile Communications Network Inc.Control circuit for automatically controlled feed forward nonlinear distortion compensation amplifier

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Cited By (9)

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    EP-0966097-A1December 22, 1999Nec CorporationVorwärtskopplungsverstärker
    EP-1590893-A2November 02, 2005Powerwave Technologies, Inc.Systeme d'amplificateur a correction aval faisant appel a des listes d'alignement autogenerees et a un controleur adaptatif
    EP-1590893-A4June 21, 2006Powerwave Technologies IncSysteme d'amplificateur a correction aval faisant appel a des listes d'alignement autogenerees et a un controleur adaptatif
    FR-2766306-A1January 22, 1999Telediffusion FseDispositif de correction de distorsions pour amplificateur
    KR-100855198-B1September 01, 2008파워웨이브 테크놀로지스, 인크.얼라인먼트 셋팅들의 계층 리스트 생성 방법 및 증폭기시스템 제어 방법
    US-6163210-ADecember 19, 2000Nec CorporationFeed-forward amplifier with improved linearity upon initial activation
    US-6836671-B2December 28, 2004Nokia CorporationAmplifier circuitry
    US-7289773-B2October 30, 2007Powerwave Technologies, Inc.Digital transmitter system employing self-generating predistortion parameter lists and adaptive controller
    WO-0002308-A1January 13, 2000Nokia Networks OyCircuit amplificateur