JPS5683107A - Gain control circuit - Google Patents

Gain control circuit

Info

Publication number
JPS5683107A
JPS5683107A JP15997179A JP15997179A JPS5683107A JP S5683107 A JPS5683107 A JP S5683107A JP 15997179 A JP15997179 A JP 15997179A JP 15997179 A JP15997179 A JP 15997179A JP S5683107 A JPS5683107 A JP S5683107A
Authority
JP
Japan
Prior art keywords
signal
control
gain control
control signal
differential
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
JP15997179A
Other languages
Japanese (ja)
Inventor
Tatsuki Ide
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 JP15997179A priority Critical patent/JPS5683107A/en
Publication of JPS5683107A publication Critical patent/JPS5683107A/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
    • H03G1/0017—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

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To make the control sensitivity constant to the control signal, by the gain control with the same control signal, through a series connection of two sets of differential transistor pairs. CONSTITUTION:After the signal S1 input from the base of a transistor (TR)T11 is converted into a signal current at TRT11, it is divided according to the control signal VF and the reference bias VE for the DC potential, through the 1st differential transistor pair 31. One of the divided currents flows to a load resistor RL through the current division at the signal VF by the 2nd differential transistor pair 32 similarly. The signal current flowing to the resistor RL becomes the output signal of gain control. Thus, by connecting two sets of differential TRs 31, 32 in series and performing the gain control with the same control signal at the same time, the control sensitivity to the control signal is made constant.
JP15997179A 1979-12-10 1979-12-10 Gain control circuit Pending JPS5683107A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15997179A JPS5683107A (en) 1979-12-10 1979-12-10 Gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15997179A JPS5683107A (en) 1979-12-10 1979-12-10 Gain control circuit

Publications (1)

Publication Number Publication Date
JPS5683107A true JPS5683107A (en) 1981-07-07

Family

ID=15705164

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15997179A Pending JPS5683107A (en) 1979-12-10 1979-12-10 Gain control circuit

Country Status (1)

Country Link
JP (1) JPS5683107A (en)

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