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BR9805453A - Circuito de controle limitador progamável para amplificadores de ganho variável. - Google Patents

Circuito de controle limitador progamável para amplificadores de ganho variável.

Info

Publication number
BR9805453A
BR9805453A BR9805453-8A BR9805453A BR9805453A BR 9805453 A BR9805453 A BR 9805453A BR 9805453 A BR9805453 A BR 9805453A BR 9805453 A BR9805453 A BR 9805453A
Authority
BR
Brazil
Prior art keywords
currents
agc
control circuit
current amplifier
control
Prior art date
Application number
BR9805453-8A
Other languages
English (en)
Inventor
Robert N Ruth Jr
John B Groe
Damian Costa
Roy Enright
Original Assignee
Nokia Mobile Phones Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Mobile Phones Ltd filed Critical Nokia Mobile Phones Ltd
Publication of BR9805453A publication Critical patent/BR9805453A/pt

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0017—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid-state elements
    • H03G1/0023—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid-state elements in emitter-coupled or cascode amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/06—Volume compression or expansion in amplifiers having semiconductor devices

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Amplifiers (AREA)

Abstract

<B>"CIRCUITO DE CONTROLE LIMITADOR PROGRAMáVEL PARA AMPLIFICADORES DE GANHO VARIáVEL."<D> O circuito de controle de ganho automático (AGC) de entrada e voltagens de referência (REF), são convertidos em correntes e fornecidos como entradas diferenciais a um amplificador de corrente. O amplificador de corrente afere essas correntes de modo proporcional à temperatura absoluta. O princípio translinear é usado para produzir o amplificador de corrente e assegurar a linearidade das correntes de saída diferencial. Essas correntes são depois convertidas em voltagens, por meio dos elementos resistores. O resultado é aplicado a um par diferencial simples que produz duas correntes de controle de circuito de controle de ganho automático (AGC), que seguem a função de tangente hiperbólica. As duas correntes de controle de AGC são iguais quando as entradas de AGC forem 3/4 do valor de referência. A resposta de ganho global é bem modelada por meio de uma função de segundo grau e é auto-limitante em altos valores de ganho.
BR9805453-8A 1997-12-19 1998-12-18 Circuito de controle limitador progamável para amplificadores de ganho variável. BR9805453A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/995,058 US6084471A (en) 1997-12-19 1997-12-19 Soft-limiting control circuit for variable gain amplifiers

Publications (1)

Publication Number Publication Date
BR9805453A true BR9805453A (pt) 1999-11-09

Family

ID=25541340

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9805453-8A BR9805453A (pt) 1997-12-19 1998-12-18 Circuito de controle limitador progamável para amplificadores de ganho variável.

Country Status (4)

Country Link
US (1) US6084471A (pt)
EP (1) EP0926820A3 (pt)
KR (1) KR19990062583A (pt)
BR (1) BR9805453A (pt)

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JP2001007654A (ja) * 1999-06-21 2001-01-12 Mitsubishi Electric Corp 信号強度検出装置
JP2001127701A (ja) * 1999-10-28 2001-05-11 Hitachi Ltd 電力増幅器モジュール
JP2001320243A (ja) * 2000-05-12 2001-11-16 Sony Corp バイアス回路およびこれを用いた無線通信装置
US6711391B1 (en) * 2000-10-10 2004-03-23 Qualcomm, Incorporated Gain linearizer for variable gain amplifiers
KR100475405B1 (ko) * 2002-07-30 2005-03-10 한국과학기술원 보상회로를 갖는 가변이득증폭기
US6798291B2 (en) 2002-11-12 2004-09-28 Koninklijke Philips Electronics N.V. Variable gain current amplifier with a feedback loop including a differential pair
US6906592B2 (en) * 2002-11-13 2005-06-14 Qualcomm Inc Continuously variable gain radio frequency driver amplifier having linear in decibel gain control characteristics
KR100499858B1 (ko) * 2002-12-10 2005-07-08 한국전자통신연구원 가변 이득 증폭기
US7026874B2 (en) * 2003-02-24 2006-04-11 Nokia Corporation Methods and apparatus for improving the operation of a variable gain amplifier (VGA)
US7027783B2 (en) 2003-02-24 2006-04-11 Sami Vilhonen Method and apparatus providing reduction in transmitter current consumption using signal derived from rectified input signal
FR2856186A1 (fr) * 2003-06-12 2004-12-17 St Microelectronics Sa Memoire flash comprenant des moyens de controle et de rafraichissement de cellules memoire dans l'etat efface
US7084704B2 (en) * 2003-07-31 2006-08-01 Skyworks Solutions, Inc. Variable gain amplifier system
FR2864725A1 (fr) * 2003-12-29 2005-07-01 St Microelectronics Sa Cellule d'attenuation presentant un dispositif de commande du facteur d'attenuation
US7274916B2 (en) * 2004-07-23 2007-09-25 Texas Instruments Incorporated Differential signal receiver and method
JP4997730B2 (ja) * 2005-08-31 2012-08-08 パナソニック株式会社 可変利得増幅器およびそれを用いた交流電源装置
WO2008074149A1 (en) * 2006-12-21 2008-06-26 Icera Canada ULC Current controlled biasing for current-steering based rf variable gain amplifiers
KR100732068B1 (ko) * 2006-06-30 2007-06-27 (주)에프씨아이 지수적인 선형성을 갖는 가변 이득 증폭기
US20090252347A1 (en) * 2008-04-07 2009-10-08 Srinath Kakkeri Method and Apparatus For Automatic Gain Control
US8305133B2 (en) * 2010-10-01 2012-11-06 Texas Instruments Incorporated Implementing a piecewise-polynomial-continuous function in a translinear circuit
KR101076004B1 (ko) 2011-04-19 2011-10-21 삼성탈레스 주식회사 캐스케이드 로그 비디오 증폭기를 이용한 광대역 고감도 검파 로그 비디오 증폭기
EP2733465A1 (en) 2012-11-16 2014-05-21 Infineon Technologies AG Sensor signal processing using translinear mesh
WO2014182474A1 (en) * 2013-05-09 2014-11-13 The Regents Of The University Of California Differential current mode low latency modulation and demodulation for chip-to-chip connection
KR102410898B1 (ko) * 2021-02-23 2022-06-22 광주과학기술원 전류 모드 라인 드라이버 장치 및 이의 동작 방법

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JPS5330850A (en) * 1976-09-03 1978-03-23 Hitachi Ltd Gain control circuit
US4413235A (en) * 1981-02-23 1983-11-01 Motorola, Inc. Low temperature coefficient logarithmic electronic gain controlled amplifier
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GB2233516B (en) * 1989-06-23 1994-01-05 Orbitel Mobile Communications An automatic gain control system
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US5469106A (en) * 1994-10-25 1995-11-21 Elantec, Inc. Voltage controlled amplifier which reduces differential gain
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US5528197A (en) * 1995-06-06 1996-06-18 Analog Devices, Inc. Voltage controlled amplifier
US5572166A (en) * 1995-06-07 1996-11-05 Analog Devices, Inc. Linear-in-decibel variable gain amplifier
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Also Published As

Publication number Publication date
KR19990062583A (ko) 1999-07-26
EP0926820A2 (en) 1999-06-30
EP0926820A3 (en) 2001-01-17
US6084471A (en) 2000-07-04

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Legal Events

Date Code Title Description
B08F Application fees: application dismissed [chapter 8.6 patent gazette]

Free format text: REFERENTE A 6A, 7A E 8A ANUIDADES.

B08K Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]

Free format text: REFERENTE AO DESPACHO 8.6 PUBLICADO NA RPI 1872 DE 21/11/2006.