JPS5715512A - Gain controller - Google Patents

Gain controller

Info

Publication number
JPS5715512A
JPS5715512A JP9024480A JP9024480A JPS5715512A JP S5715512 A JPS5715512 A JP S5715512A JP 9024480 A JP9024480 A JP 9024480A JP 9024480 A JP9024480 A JP 9024480A JP S5715512 A JPS5715512 A JP S5715512A
Authority
JP
Japan
Prior art keywords
current
impedance
circuit
variance
emitter
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.)
Granted
Application number
JP9024480A
Other languages
Japanese (ja)
Other versions
JPS625489B2 (en
Inventor
Masami Onishi
Mitsuo Isobe
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP9024480A priority Critical patent/JPS5715512A/en
Publication of JPS5715512A publication Critical patent/JPS5715512A/en
Publication of JPS625489B2 publication Critical patent/JPS625489B2/ja
Granted 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
    • H03G1/0082—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using bipolar transistor-type devices

Abstract

PURPOSE:To increase the dynamic range of the circuit and to stabilize the frequency characteristics, by using a saturable impedance between the collector and the emitter of two pairs of transistors as a variable impedance circuit. CONSTITUTION:The current value of a constant current source 15 is changed, the impedance between the collector and the emitter of transistors (TR)13, 14 is changed and the gain is controlled by changing the current shunting ratio between a signal current is and the input signal current to a differential amplifying circuit. The impedance circuits 16, 17 reduce the variance of the maximum gain due to the variance of the current amplification factor of the TRs 13, 14 of differential amplifier stage at the maximum gain.
JP9024480A 1980-07-02 1980-07-02 Gain controller Granted JPS5715512A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9024480A JPS5715512A (en) 1980-07-02 1980-07-02 Gain controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9024480A JPS5715512A (en) 1980-07-02 1980-07-02 Gain controller

Publications (2)

Publication Number Publication Date
JPS5715512A true JPS5715512A (en) 1982-01-26
JPS625489B2 JPS625489B2 (en) 1987-02-05

Family

ID=13993080

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9024480A Granted JPS5715512A (en) 1980-07-02 1980-07-02 Gain controller

Country Status (1)

Country Link
JP (1) JPS5715512A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58196706A (en) * 1982-05-11 1983-11-16 Matsushita Electric Ind Co Ltd Control circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58196706A (en) * 1982-05-11 1983-11-16 Matsushita Electric Ind Co Ltd Control circuit

Also Published As

Publication number Publication date
JPS625489B2 (en) 1987-02-05

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