JPS5728412A - Gain control circuit - Google Patents

Gain control circuit

Info

Publication number
JPS5728412A
JPS5728412A JP10386080A JP10386080A JPS5728412A JP S5728412 A JPS5728412 A JP S5728412A JP 10386080 A JP10386080 A JP 10386080A JP 10386080 A JP10386080 A JP 10386080A JP S5728412 A JPS5728412 A JP S5728412A
Authority
JP
Japan
Prior art keywords
gain control
trs
base
emitter
voltage
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
JP10386080A
Other languages
Japanese (ja)
Other versions
JPS6337965B2 (en
Inventor
Naotoshi Higashiyama
Kazuyuki Doi
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.)
NEC Corp
NEC Engineering Ltd
Original Assignee
NEC Corp
NEC Engineering Ltd
Nippon Electric 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 NEC Corp, NEC Engineering Ltd, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP10386080A priority Critical patent/JPS5728412A/en
Publication of JPS5728412A publication Critical patent/JPS5728412A/en
Publication of JPS6337965B2 publication Critical patent/JPS6337965B2/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
    • H03G1/0017—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 of the amplifier
    • 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 of the amplifier in emitter-coupled or cascode amplifiers

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To make the setting of the range of gain control easy, by applying an input signal to a common emitter of the 1st differential amplifying circuit, and a constant current and a collector voltage of the 2nd differential amplifying circuit to which a gain control voltage is applied, to the base. CONSTITUTION:An input signal inputted from an input terminal (a) is amplified at a transistor (TR) 1 and applied to a common emitter of TRs 3, 4 to obtain an output obtained at a load 14 from an output terminal (c). On the other hand, the change in the gain control voltage applied to base terminals (g), (h) of TRs 9, 10 is detected as the change in the difference between the base and the emitter of emitter follower TRs 7, 8 and applied as the base voltage difference of the TRs 3, 4. Even if the collector current of a TR10 does not flow by the gain control voltage, the voltage difference between the base and the emitter of the TRs 7, 8 is fixed to a given voltage difference with the current of the constant current circuit consisting of a TR12 and a resistor 17.
JP10386080A 1980-07-29 1980-07-29 Gain control circuit Granted JPS5728412A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10386080A JPS5728412A (en) 1980-07-29 1980-07-29 Gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10386080A JPS5728412A (en) 1980-07-29 1980-07-29 Gain control circuit

Publications (2)

Publication Number Publication Date
JPS5728412A true JPS5728412A (en) 1982-02-16
JPS6337965B2 JPS6337965B2 (en) 1988-07-27

Family

ID=14365196

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10386080A Granted JPS5728412A (en) 1980-07-29 1980-07-29 Gain control circuit

Country Status (1)

Country Link
JP (1) JPS5728412A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5635514A (en) * 1979-08-31 1981-04-08 Toshiba Corp Gain control amplifier

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5635514A (en) * 1979-08-31 1981-04-08 Toshiba Corp Gain control amplifier

Also Published As

Publication number Publication date
JPS6337965B2 (en) 1988-07-27

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