JPS5660108A - Gain control circuit - Google Patents

Gain control circuit

Info

Publication number
JPS5660108A
JPS5660108A JP13954980A JP13954980A JPS5660108A JP S5660108 A JPS5660108 A JP S5660108A JP 13954980 A JP13954980 A JP 13954980A JP 13954980 A JP13954980 A JP 13954980A JP S5660108 A JPS5660108 A JP S5660108A
Authority
JP
Japan
Prior art keywords
diodes
gain control
signal
diode
impedance
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
JP13954980A
Other languages
Japanese (ja)
Other versions
JPS5756247B2 (en
Inventor
Hiromi Kawakami
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP13954980A priority Critical patent/JPS5660108A/en
Publication of JPS5660108A publication Critical patent/JPS5660108A/en
Publication of JPS5756247B2 publication Critical patent/JPS5756247B2/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
    • H03G1/0052—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using diodes

Abstract

PURPOSE:To improve a noise index by differentially controlling currents flowing to the 1st and 2nd diodes by a gain control signal. CONSTITUTION:Bias voltages of diodes 10 and 11 are controlled by the gain control signal of a DC voltage from gain control signal supply terminal 9 to control the impedance of diodes 10 and 11 and the level of a signal from input terminal 5 is controlled by those diodes 10 and 11 to lead out a controlled signal from output terminal 8. Consequently, as the voltage of terminal 9 is increased, the electric current flowing to transistor 3 increases and the impedance of diode 11 decreases. The electric current flowing to the diode decreases by the increment of the current flowing to diode 11 and its impedance increases, so that the gain to a signal to be transmitted will decrease greatly. Since diodes 10 and 11 used, there is no thermal noise due to base expansion resistance rbb' of the transistor, so that the noise index can be improved.
JP13954980A 1980-10-06 1980-10-06 Gain control circuit Granted JPS5660108A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13954980A JPS5660108A (en) 1980-10-06 1980-10-06 Gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13954980A JPS5660108A (en) 1980-10-06 1980-10-06 Gain control circuit

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP10440071A Division JPS5630721B2 (en) 1971-12-22 1971-12-22

Publications (2)

Publication Number Publication Date
JPS5660108A true JPS5660108A (en) 1981-05-23
JPS5756247B2 JPS5756247B2 (en) 1982-11-29

Family

ID=15247842

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13954980A Granted JPS5660108A (en) 1980-10-06 1980-10-06 Gain control circuit

Country Status (1)

Country Link
JP (1) JPS5660108A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60162214A (en) * 1984-02-03 1985-08-24 Konishiroku Photo Ind Co Ltd Lens moving mechanism

Also Published As

Publication number Publication date
JPS5756247B2 (en) 1982-11-29

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