JPS6461109A - Variable gain amplifier circuit - Google Patents

Variable gain amplifier circuit

Info

Publication number
JPS6461109A
JPS6461109A JP21758587A JP21758587A JPS6461109A JP S6461109 A JPS6461109 A JP S6461109A JP 21758587 A JP21758587 A JP 21758587A JP 21758587 A JP21758587 A JP 21758587A JP S6461109 A JPS6461109 A JP S6461109A
Authority
JP
Japan
Prior art keywords
operational amplifier
switches
sets
resistors
amplifier circuit
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
JP21758587A
Other languages
Japanese (ja)
Inventor
Miki Abe
Takaaki Yamada
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP21758587A priority Critical patent/JPS6461109A/en
Publication of JPS6461109A publication Critical patent/JPS6461109A/en
Pending legal-status Critical Current

Links

Landscapes

  • Analogue/Digital Conversion (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To improve the linearity and accuracy of gain control by using a resistor string comprising 2<n> sets of unit resistors so as to divide an output of an operational amplifier, feeding back the result to its inverting input and controlling the feedback quantity by an n-bit digital input data. CONSTITUTION:Among an output terminal of an operational amplifier 2, each connection midpoint of 2<n> sets of resistors 51-5L and an inverting input of the operational amplifier 2, 2<n> sets of switches 61-6L are connected respectively. A control signal is supplied to the switches 61-6L respectively from output terminals 71-7L of a decoder 7 receiving an n-bit digital input data and any of the switches, such as the switch 63, is closed selectively. Since the resistance of the resistors 51-5L of the resistor string is equal to each other, an excellent linearity is obtained for the operational amplifier 2.
JP21758587A 1987-08-31 1987-08-31 Variable gain amplifier circuit Pending JPS6461109A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21758587A JPS6461109A (en) 1987-08-31 1987-08-31 Variable gain amplifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21758587A JPS6461109A (en) 1987-08-31 1987-08-31 Variable gain amplifier circuit

Publications (1)

Publication Number Publication Date
JPS6461109A true JPS6461109A (en) 1989-03-08

Family

ID=16706590

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21758587A Pending JPS6461109A (en) 1987-08-31 1987-08-31 Variable gain amplifier circuit

Country Status (1)

Country Link
JP (1) JPS6461109A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05327376A (en) * 1992-05-20 1993-12-10 Fujitsu Ltd Digital control variable gain circuit
JP2002271155A (en) * 2001-03-13 2002-09-20 Sony Corp Audio amplifier
KR101102975B1 (en) * 2004-12-30 2012-01-05 매그나칩 반도체 유한회사 Digital controlled variable gain amplifier
JP2012147219A (en) * 2011-01-12 2012-08-02 Ricoh Co Ltd Volume control circuit
JP2016082504A (en) * 2014-10-21 2016-05-16 ローム株式会社 Variable gain amplifier circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05327376A (en) * 1992-05-20 1993-12-10 Fujitsu Ltd Digital control variable gain circuit
JP2002271155A (en) * 2001-03-13 2002-09-20 Sony Corp Audio amplifier
KR101102975B1 (en) * 2004-12-30 2012-01-05 매그나칩 반도체 유한회사 Digital controlled variable gain amplifier
JP2012147219A (en) * 2011-01-12 2012-08-02 Ricoh Co Ltd Volume control circuit
JP2016082504A (en) * 2014-10-21 2016-05-16 ローム株式会社 Variable gain amplifier circuit

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