JPS5787219A - Variable gain amplifying circuit - Google Patents

Variable gain amplifying circuit

Info

Publication number
JPS5787219A
JPS5787219A JP55162279A JP16227980A JPS5787219A JP S5787219 A JPS5787219 A JP S5787219A JP 55162279 A JP55162279 A JP 55162279A JP 16227980 A JP16227980 A JP 16227980A JP S5787219 A JPS5787219 A JP S5787219A
Authority
JP
Japan
Prior art keywords
turned
equal
amplifier
control signal
output
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
JP55162279A
Other languages
Japanese (ja)
Other versions
JPH0119289B2 (en
Inventor
Yoshiaki Kubo
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.)
Tokyo Sanyo Electric Co Ltd
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Original Assignee
Tokyo Sanyo Electric Co Ltd
Sanyo Electric Co Ltd
Sanyo Denki 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 Tokyo Sanyo Electric Co Ltd, Sanyo Electric Co Ltd, Sanyo Denki Co Ltd filed Critical Tokyo Sanyo Electric Co Ltd
Priority to JP55162279A priority Critical patent/JPS5787219A/en
Publication of JPS5787219A publication Critical patent/JPS5787219A/en
Publication of JPH0119289B2 publication Critical patent/JPH0119289B2/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

  • Processing Of Color Television Signals (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To amplify or attenuate the output of a differential connection amplifier during the period corresponding to a control signal, by providing a switching means in the output side of the amplifier and by controlling an input signal of the amplifier by the control signal. CONSTITUTION:When a control signal vc to a terminal 12 is low-level, a transistor TR23 is turned off, and a bias source TR14 is turned on. By setting a large voltage drop due to a resistance 26, a switching TR20 is turned on, and a TR21 is turned off, and all of the current IO of a TR10 for constant current is flowed to the TR20, and only TRs 16 and 17 are operated as a differential amplifier. When collector resistances R8, R9, and RC of the differential amplifier are equal to one another and emitter resistances R10-R13 are equal to an emitter resistance RE, an output voltage vO is equal to (RC/2RE).vi (vi is an input voltage of a terminal 11). When the signal vC is high-level, the TR23 is turned on, and a TR22 is turned off, and TRs 20 and 21 are turned on, and four TRs 16, 17, 18, and 19 are operated as differential amplifiers, and the output voltage vO is equal to RC/REXvi, and thus, the output signal is changed in accordance with the control signal.
JP55162279A 1980-11-17 1980-11-17 Variable gain amplifying circuit Granted JPS5787219A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55162279A JPS5787219A (en) 1980-11-17 1980-11-17 Variable gain amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55162279A JPS5787219A (en) 1980-11-17 1980-11-17 Variable gain amplifying circuit

Publications (2)

Publication Number Publication Date
JPS5787219A true JPS5787219A (en) 1982-05-31
JPH0119289B2 JPH0119289B2 (en) 1989-04-11

Family

ID=15751448

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55162279A Granted JPS5787219A (en) 1980-11-17 1980-11-17 Variable gain amplifying circuit

Country Status (1)

Country Link
JP (1) JPS5787219A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60260217A (en) * 1984-06-06 1985-12-23 Pioneer Electronic Corp Amplifier
FR2642918A1 (en) * 1989-02-09 1990-08-10 Cit Alcatel Wide-band amplifier circuit with automatic gain control
EP0812062A2 (en) * 1996-06-07 1997-12-10 Nec Corporation Gain-variable amplifier with wide control range

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5162753U (en) * 1974-11-09 1976-05-18
JPS55138910A (en) * 1979-04-18 1980-10-30 Hitachi Ltd Amplifying circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5162753U (en) * 1974-11-09 1976-05-18
JPS55138910A (en) * 1979-04-18 1980-10-30 Hitachi Ltd Amplifying circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60260217A (en) * 1984-06-06 1985-12-23 Pioneer Electronic Corp Amplifier
FR2642918A1 (en) * 1989-02-09 1990-08-10 Cit Alcatel Wide-band amplifier circuit with automatic gain control
EP0812062A2 (en) * 1996-06-07 1997-12-10 Nec Corporation Gain-variable amplifier with wide control range
EP0812062A3 (en) * 1996-06-07 1999-06-16 Nec Corporation Gain-variable amplifier with wide control range

Also Published As

Publication number Publication date
JPH0119289B2 (en) 1989-04-11

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