JPS5693408A - Variable gain amplifier - Google Patents

Variable gain amplifier

Info

Publication number
JPS5693408A
JPS5693408A JP17069679A JP17069679A JPS5693408A JP S5693408 A JPS5693408 A JP S5693408A JP 17069679 A JP17069679 A JP 17069679A JP 17069679 A JP17069679 A JP 17069679A JP S5693408 A JPS5693408 A JP S5693408A
Authority
JP
Japan
Prior art keywords
operational amplifier
resistance
terminal
variable gain
gain amplifier
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
JP17069679A
Other languages
Japanese (ja)
Other versions
JPS6313572B2 (en
Inventor
Kunihiko Yoshimura
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
Original Assignee
NEC Corp
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, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP17069679A priority Critical patent/JPS5693408A/en
Publication of JPS5693408A publication Critical patent/JPS5693408A/en
Publication of JPS6313572B2 publication Critical patent/JPS6313572B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/001—Digital control of analog signals

Landscapes

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

Abstract

PURPOSE:To increase the number of degrees of freedom of the gain by dividing the 2R terminal resistance of the R-2R ladder resistance circuit forming the feedback circuit of the operational amplifier by XR and (2-X)R by connecting these division points to the inversion input terminal. CONSTITUTION:R-2R ladder resistance circuit 20 having bit switches 3-1-3-n is used as the feedback network of operational amplifier 1. The resistance of 2R for terminal of ladder resistance circuit 20 is divided by XR and (2-X)R, and these division points are connected to inversion input terminal 12 of operational amplifier 1. Thus, the resistance at the view of the operational amplifier 1 side from point A is 2R, and relation R-2R is kept. Further, the gain variable range is set freely by selecting X.
JP17069679A 1979-12-27 1979-12-27 Variable gain amplifier Granted JPS5693408A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17069679A JPS5693408A (en) 1979-12-27 1979-12-27 Variable gain amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17069679A JPS5693408A (en) 1979-12-27 1979-12-27 Variable gain amplifier

Publications (2)

Publication Number Publication Date
JPS5693408A true JPS5693408A (en) 1981-07-29
JPS6313572B2 JPS6313572B2 (en) 1988-03-26

Family

ID=15909695

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17069679A Granted JPS5693408A (en) 1979-12-27 1979-12-27 Variable gain amplifier

Country Status (1)

Country Link
JP (1) JPS5693408A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5859221U (en) * 1981-10-16 1983-04-21 横河電機株式会社 Amplifier gain switching circuit
JPS58218212A (en) * 1982-06-11 1983-12-19 Nec Corp Variable gain amplifier
JPS5922411A (en) * 1982-07-28 1984-02-04 Shimadzu Corp Amplifying circuit
JPS60167415U (en) * 1984-04-12 1985-11-07 横河電機株式会社 feedback amplifier circuit
JPS60259007A (en) * 1984-06-05 1985-12-21 Comput Basic Mach Technol Res Assoc Variable gain amplifier
JPS62173809A (en) * 1986-01-28 1987-07-30 Fujitsu Ltd Amplifier
WO2003084059A1 (en) * 2002-03-28 2003-10-09 Thine Electronics, Inc. Semiconductor integrated circuit
JP2010193233A (en) * 2009-02-19 2010-09-02 Rohm Co Ltd Variable gain amplifier

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5859221U (en) * 1981-10-16 1983-04-21 横河電機株式会社 Amplifier gain switching circuit
JPH0233388Y2 (en) * 1981-10-16 1990-09-07
JPS58218212A (en) * 1982-06-11 1983-12-19 Nec Corp Variable gain amplifier
JPH0226802B2 (en) * 1982-06-11 1990-06-13 Nippon Electric Co
JPS5922411A (en) * 1982-07-28 1984-02-04 Shimadzu Corp Amplifying circuit
JPS60167415U (en) * 1984-04-12 1985-11-07 横河電機株式会社 feedback amplifier circuit
JPH0441618Y2 (en) * 1984-04-12 1992-09-30
JPS60259007A (en) * 1984-06-05 1985-12-21 Comput Basic Mach Technol Res Assoc Variable gain amplifier
JPS62173809A (en) * 1986-01-28 1987-07-30 Fujitsu Ltd Amplifier
WO2003084059A1 (en) * 2002-03-28 2003-10-09 Thine Electronics, Inc. Semiconductor integrated circuit
JP2010193233A (en) * 2009-02-19 2010-09-02 Rohm Co Ltd Variable gain amplifier

Also Published As

Publication number Publication date
JPS6313572B2 (en) 1988-03-26

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