JPS57183110A - Bipolar gain control circuit - Google Patents

Bipolar gain control circuit

Info

Publication number
JPS57183110A
JPS57183110A JP6760781A JP6760781A JPS57183110A JP S57183110 A JPS57183110 A JP S57183110A JP 6760781 A JP6760781 A JP 6760781A JP 6760781 A JP6760781 A JP 6760781A JP S57183110 A JPS57183110 A JP S57183110A
Authority
JP
Japan
Prior art keywords
base
bipolar
control circuit
gain control
collector current
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
JP6760781A
Other languages
Japanese (ja)
Inventor
Hiroki Yamauchi
Koichi Shiyudo
Tetsushi Sakai
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP6760781A priority Critical patent/JPS57183110A/en
Publication of JPS57183110A publication Critical patent/JPS57183110A/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

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To obtain a gain control circuit suitable for IC-inplementation by applying a control voltage to the base of one of two bipolar transistors (TR) connected in series, and thus varying the base resistance of the other TR. CONSTITUTION:A signal Vi inputted to a terminal 6 is amplified by a TR1 and then inputted to the base of a trailing TR4. A collector current flowing through the TR4 varies with a control voltage VAGC applied to the base of a TR3 whose collector is connected to the emitter of the TR4. The internal base resistance of the TR4 varies with the collector current of the TR3. In general, the internal base resistance of a bipolar TR decreases by one-two digits by clouding effect as the collector current increases. As a result, the gain is controllable. This circuit is formed only by bipolar technique.
JP6760781A 1981-05-07 1981-05-07 Bipolar gain control circuit Pending JPS57183110A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6760781A JPS57183110A (en) 1981-05-07 1981-05-07 Bipolar gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6760781A JPS57183110A (en) 1981-05-07 1981-05-07 Bipolar gain control circuit

Publications (1)

Publication Number Publication Date
JPS57183110A true JPS57183110A (en) 1982-11-11

Family

ID=13349784

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6760781A Pending JPS57183110A (en) 1981-05-07 1981-05-07 Bipolar gain control circuit

Country Status (1)

Country Link
JP (1) JPS57183110A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4826172A (en) * 1971-08-06 1973-04-05
JPS5256842A (en) * 1975-11-05 1977-05-10 Sony Corp Transistor circuit
JPS5355A (en) * 1976-06-24 1978-01-05 Sony Corp Transistor circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4826172A (en) * 1971-08-06 1973-04-05
JPS5256842A (en) * 1975-11-05 1977-05-10 Sony Corp Transistor circuit
JPS5355A (en) * 1976-06-24 1978-01-05 Sony Corp Transistor circuit

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