JPS577606A - Gain control circuit - Google Patents

Gain control circuit

Info

Publication number
JPS577606A
JPS577606A JP8265880A JP8265880A JPS577606A JP S577606 A JPS577606 A JP S577606A JP 8265880 A JP8265880 A JP 8265880A JP 8265880 A JP8265880 A JP 8265880A JP S577606 A JPS577606 A JP S577606A
Authority
JP
Japan
Prior art keywords
gain
gain control
agc voltage
diodes
wide
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.)
Pending
Application number
JP8265880A
Other languages
Japanese (ja)
Inventor
Haruo Suzuki
Kiyoshi Amasawa
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.)
Faurecia Clarion Electronics Co Ltd
Original Assignee
Clarion Co 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 Clarion Co Ltd filed Critical Clarion Co Ltd
Priority to JP8265880A priority Critical patent/JPS577606A/en
Publication of JPS577606A publication Critical patent/JPS577606A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
    • H03G1/0052—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using diodes

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To exercise wide-range gain control by varying the gain of a differential amplifier through diodes, whose conduction resistance vary with an AGC voltage, for the intermediate-frequency gain control of an IC-impelemented AM radio set. CONSTITUTION:An AGC voltage obtained from an AGC voltage circuit 2, which controls the gain of the intermediate-frequency amplification stage of an IC-implemented AM radio flows from a current-source transistor (TR)T6 to a suction TRT7 through a middle point (a) between diodes (d)1 and 2 and another middle point (b) between Ds 3 and 6. Conduction resistances of the D1-D4 vary with the current flowing through the TRT6. Those D1-D4 are connected between input terminals of TRs T1 and T2 constituting a differential amplifier. Therefore, when the conduction resistances of the D1-D4 are nearly zero, the gain is zero and when extremely large, on the other hand, the largest gain is obtained. Thus, wide-range gain control is exercised.
JP8265880A 1980-06-17 1980-06-17 Gain control circuit Pending JPS577606A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8265880A JPS577606A (en) 1980-06-17 1980-06-17 Gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8265880A JPS577606A (en) 1980-06-17 1980-06-17 Gain control circuit

Publications (1)

Publication Number Publication Date
JPS577606A true JPS577606A (en) 1982-01-14

Family

ID=13780527

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8265880A Pending JPS577606A (en) 1980-06-17 1980-06-17 Gain control circuit

Country Status (1)

Country Link
JP (1) JPS577606A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4531097A (en) * 1982-06-22 1985-07-23 Texas Instruments Deutschland Gmbh High frequency amplifier
US4571594A (en) * 1983-09-02 1986-02-18 The United States Of America As Represented By The Secretary Of The Air Force Directional antenna system having sidelobe suppression

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4531097A (en) * 1982-06-22 1985-07-23 Texas Instruments Deutschland Gmbh High frequency amplifier
US4571594A (en) * 1983-09-02 1986-02-18 The United States Of America As Represented By The Secretary Of The Air Force Directional antenna system having sidelobe suppression

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