JPS57208718A - Control circuit for voltage controlled variable attenuator - Google Patents

Control circuit for voltage controlled variable attenuator

Info

Publication number
JPS57208718A
JPS57208718A JP9445081A JP9445081A JPS57208718A JP S57208718 A JPS57208718 A JP S57208718A JP 9445081 A JP9445081 A JP 9445081A JP 9445081 A JP9445081 A JP 9445081A JP S57208718 A JPS57208718 A JP S57208718A
Authority
JP
Japan
Prior art keywords
voltage
variable attenuator
differential
trs
input
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
JP9445081A
Other languages
Japanese (ja)
Other versions
JPH0319723B2 (en
Inventor
Yoshihiro Kanabe
Hideki Fujimoto
Akira Nishioka
Hiroyuki Takabori
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.)
Pioneer Corp
Original Assignee
Pioneer Corp
Pioneer Electronic 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 Pioneer Corp, Pioneer Electronic Corp filed Critical Pioneer Corp
Priority to JP9445081A priority Critical patent/JPS57208718A/en
Publication of JPS57208718A publication Critical patent/JPS57208718A/en
Publication of JPH0319723B2 publication Critical patent/JPH0319723B2/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

Abstract

PURPOSE:To obtain a suitable control circuit using a variable attenuator of differential amplifier form as a sound adjusting volume, by applying an external control signal to an input of a circuit in which an input and output transfer characteristic is nonlinear by regarding the output as controlled voltage. CONSTITUTION:Bipolar transistors (TRs)Q4 and Q5 being nonlinear elements are constituted as a differential pair, and a current source of current mirror type consisting of TRs Q6 and Q7 and resistors R3-R5 is constituted as a constant current source to obtain a differential type. An external control signal VA with linear level change is applied to a differential input of the differential amplifier and a current I1 flowing to a collector resistor R6 of the TRQ5 is transferred to an output load resistor RL for voltage conversion with a current mirror circuit consisting of TRs Q8 and Q9 and resistors R6 and R7. A voltage across the load resistor RL is used as a control voltage Vc of the voltage controlled variable attenuator of differential amplifier constitution.
JP9445081A 1981-06-18 1981-06-18 Control circuit for voltage controlled variable attenuator Granted JPS57208718A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9445081A JPS57208718A (en) 1981-06-18 1981-06-18 Control circuit for voltage controlled variable attenuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9445081A JPS57208718A (en) 1981-06-18 1981-06-18 Control circuit for voltage controlled variable attenuator

Publications (2)

Publication Number Publication Date
JPS57208718A true JPS57208718A (en) 1982-12-21
JPH0319723B2 JPH0319723B2 (en) 1991-03-15

Family

ID=14110592

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9445081A Granted JPS57208718A (en) 1981-06-18 1981-06-18 Control circuit for voltage controlled variable attenuator

Country Status (1)

Country Link
JP (1) JPS57208718A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006126301A1 (en) * 2005-05-23 2006-11-30 Niigata Seimitsu Co., Ltd. Automatic gain control circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS522365A (en) * 1975-06-24 1977-01-10 Hitachi Ltd Variable attenuator circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS522365A (en) * 1975-06-24 1977-01-10 Hitachi Ltd Variable attenuator circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006126301A1 (en) * 2005-05-23 2006-11-30 Niigata Seimitsu Co., Ltd. Automatic gain control circuit
US7639085B2 (en) 2005-05-23 2009-12-29 Ricoh Co., Ltd. Automatic gain control circuit

Also Published As

Publication number Publication date
JPH0319723B2 (en) 1991-03-15

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