FR2444366A1 - Ensemble amplificateur a commande automatique de gain destine par exemple a un recepteur de radiodiffusion en modulation d'amplitude - Google Patents

Ensemble amplificateur a commande automatique de gain destine par exemple a un recepteur de radiodiffusion en modulation d'amplitude

Info

Publication number
FR2444366A1
FR2444366A1 FR7930379A FR7930379A FR2444366A1 FR 2444366 A1 FR2444366 A1 FR 2444366A1 FR 7930379 A FR7930379 A FR 7930379A FR 7930379 A FR7930379 A FR 7930379A FR 2444366 A1 FR2444366 A1 FR 2444366A1
Authority
FR
France
Prior art keywords
gain control
automatic gain
transistor
amplifier assembly
amplitude modulated
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
FR7930379A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Publication of FR2444366A1 publication Critical patent/FR2444366A1/fr
Withdrawn legal-status Critical Current

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
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • H03G3/3063—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver using at least one transistor as controlling device, the transistor being used as a variable impedance device
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/35—Electric hearing aids using translation techniques
    • H04R25/356—Amplitude, e.g. amplitude shift or compression

Landscapes

  • Amplifiers (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

L'invention concerne un ensemble amplificateur à commande automatique de gain pour récepteur de radio en modulation d'amplitude. Il comprend une source T1 de signaux d'entrée, un moyen de charge accordé L1, C5, un premier transistor Q4, un deuxième transistor Q15, un condensateur d'alimentation directe C4, une première résistance R6, un troisième transistor Q21, et une source produisant un premier et un second signal de commande automatique de gain qui est destinée à polariser les bases du deuxième et du troisième transistor, les signaux de commande automatique de gain étant unidirectionnels, proportionnels entre eux et de sens opposés, afin d'accroître la conduction de l'un des deuxième et troisième transistors tout en diminuant la conduction de l'autre. Le récepteur de radio selon l'invention est particulièrement destiné aux automobiles.
FR7930379A 1978-12-11 1979-12-11 Ensemble amplificateur a commande automatique de gain destine par exemple a un recepteur de radiodiffusion en modulation d'amplitude Withdrawn FR2444366A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/968,443 US4249137A (en) 1978-12-11 1978-12-11 Amplifier system with AGC, as for an AM radio

Publications (1)

Publication Number Publication Date
FR2444366A1 true FR2444366A1 (fr) 1980-07-11

Family

ID=25514280

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7930379A Withdrawn FR2444366A1 (fr) 1978-12-11 1979-12-11 Ensemble amplificateur a commande automatique de gain destine par exemple a un recepteur de radiodiffusion en modulation d'amplitude

Country Status (7)

Country Link
US (1) US4249137A (fr)
JP (1) JPS5582520A (fr)
BR (1) BR7908047A (fr)
DE (1) DE2949779A1 (fr)
FR (1) FR2444366A1 (fr)
GB (1) GB2038576A (fr)
IT (1) IT1194600B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4731585A (en) * 1987-02-24 1988-03-15 Kabushiki Kaisha Toshiba Antenna coupling circuit for magnetic resonance imaging
JPH08307181A (ja) * 1995-05-09 1996-11-22 Sony Corp レベル制御回路
US5990750A (en) * 1998-03-16 1999-11-23 Lockheed Martin Corporation Amplifier and driver system with multichannel operation
US6259323B1 (en) 1999-12-17 2001-07-10 Nokia Mobile Phones Ltd. Gain control for low noise amplifier
US6873212B2 (en) * 2001-05-17 2005-03-29 Sige Semiconductor Inc. Integrated circuit radio frequency amplifier with notch filter
DE10039438C2 (de) * 2000-08-11 2002-06-20 Infineon Technologies Ag Zweistufiger Operationsverstärker
US8064176B2 (en) * 2007-04-06 2011-11-22 Intersil Americas Inc. EOS robust bipolar transient clamp
US11735902B2 (en) 2020-03-24 2023-08-22 Analog Devices International Unlimited Company Bipolar junction transistor heater circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2243565A1 (fr) * 1973-09-10 1975-04-04 Sony Corp
DE2701412A1 (de) * 1977-01-14 1978-07-20 Hans Heinrich Prof Dr Meinke Empfangsanlage mit aktiver antenne

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3143711A (en) * 1961-04-14 1964-08-04 Collins Radio Co Transistor amplifier cutoff means at high signal levels
US3264564A (en) * 1963-02-07 1966-08-02 Rca Corp Variable impedance device for transistor automatic gain control
US3421100A (en) * 1966-11-10 1969-01-07 Rca Corp Direct coupled amplifier including twostage automatic gain control
JPS5325628B2 (fr) * 1973-02-15 1978-07-27

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2243565A1 (fr) * 1973-09-10 1975-04-04 Sony Corp
DE2701412A1 (de) * 1977-01-14 1978-07-20 Hans Heinrich Prof Dr Meinke Empfangsanlage mit aktiver antenne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MULLARD TECHNICAL COMMUNICATIONS, volume 14, no. 132, octobre 1976, MITCHAM (GB), C.R. Hewitt 'The TDA 1050 IC incar radio a.m. receivers', pages 69 - 76 *

Also Published As

Publication number Publication date
DE2949779A1 (de) 1980-06-19
US4249137A (en) 1981-02-03
GB2038576A (en) 1980-07-23
BR7908047A (pt) 1980-07-22
IT7927986A0 (it) 1979-12-07
IT1194600B (it) 1988-09-22
JPS5582520A (en) 1980-06-21

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Legal Events

Date Code Title Description
ST Notification of lapse