[go: up one dir, main page]

JPS57125506A - Operational amplifying circuit - Google Patents

Operational amplifying circuit

Info

Publication number
JPS57125506A
JPS57125506A JP1075781A JP1075781A JPS57125506A JP S57125506 A JPS57125506 A JP S57125506A JP 1075781 A JP1075781 A JP 1075781A JP 1075781 A JP1075781 A JP 1075781A JP S57125506 A JPS57125506 A JP S57125506A
Authority
JP
Japan
Prior art keywords
input
high accuracy
elements
grounded
amplifying 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.)
Granted
Application number
JP1075781A
Other languages
Japanese (ja)
Other versions
JPH0128526B2 (en
Inventor
Shigeo Kuboki
Kazuo Kato
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1075781A priority Critical patent/JPS57125506A/en
Publication of JPS57125506A publication Critical patent/JPS57125506A/en
Publication of JPH0128526B2 publication Critical patent/JPH0128526B2/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

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To enable the gain set with high accuracy and to make monolithic formation easy, by replacing one or both of input and feedback resistors of an operational amplifying circuit with on-resistance of a switching element. CONSTITUTION:Switch elements 20-29 consisting of MOSFETs are turned on or off with a selecting switching signal appeared at output lines 32-39 of decoders 30, 31 and operation is made that the resistance value of input and feedback resistors is set with that at on-state. A noninverting input 16 of an operational amplifier 1 is grounded, and an inverting input 15 is at virtual grounding point, showing equivalence as being grounded. Thus, the gate and source voltage to the elements 22-29 is the same, and since the ratio of on-resistances of the elements 22-29 is almost contact independently of the voltage change, no error is caused to the set of gain, allowing to keep high accuracy. Thus, high accuracy can simply be achieved and monolithic circuit can easily be made.
JP1075781A 1981-01-29 1981-01-29 Operational amplifying circuit Granted JPS57125506A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1075781A JPS57125506A (en) 1981-01-29 1981-01-29 Operational amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1075781A JPS57125506A (en) 1981-01-29 1981-01-29 Operational amplifying circuit

Publications (2)

Publication Number Publication Date
JPS57125506A true JPS57125506A (en) 1982-08-04
JPH0128526B2 JPH0128526B2 (en) 1989-06-02

Family

ID=11759192

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1075781A Granted JPS57125506A (en) 1981-01-29 1981-01-29 Operational amplifying circuit

Country Status (1)

Country Link
JP (1) JPS57125506A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8107910B2 (en) 2007-08-29 2012-01-31 Qualcomm, Incorporated Differential to single-ended conversion for radio frequency devices

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5583258A (en) * 1978-12-18 1980-06-23 Western Electric Co Transistor circuit unit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5583258A (en) * 1978-12-18 1980-06-23 Western Electric Co Transistor circuit unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8107910B2 (en) 2007-08-29 2012-01-31 Qualcomm, Incorporated Differential to single-ended conversion for radio frequency devices

Also Published As

Publication number Publication date
JPH0128526B2 (en) 1989-06-02

Similar Documents

Publication Publication Date Title
JPS57207405A (en) Broad band negative feedback amplifying circuit
JPS57125506A (en) Operational amplifying circuit
JPS6461109A (en) Variable gain amplifier circuit
JPS56141622A (en) Switching circuit
JPS6442924A (en) Digital/analog converter
SU708518A1 (en) Voltage regulating device
JPS5787224A (en) Linearizer
JPS5544238A (en) Signal switching circuit
SU1385258A1 (en) Amplifying device
DE3683919D1 (en) CONTROL OF A SWITCHING ELEMENT DEFINING A SEMICONDUCTOR RESISTANCE.
JPS5651609A (en) Input circuit
JPS55132600A (en) Sampling hold circuit
JPS5698913A (en) Temperature control circuit for amplifier
SU641579A1 (en) Resistance relay
DE3278005D1 (en) Dual polarity switchable operational amplifier circuit
JPS5683282A (en) Armature current controlling device
JPS5732110A (en) Time-constant switching device
JPS5719673A (en) Electric current detector with resistance change-over circuit
JPS56107638A (en) Current switch circuit
JPS5521619A (en) Ac zero cross switch
JPS6439818A (en) Switching circuit
FR2426364A1 (en) Constant response switching circuit for different frequency signals - has operational amplifier with switches in negative feedback path and voltage divider and amplifier in positive feedback path
JPS5537030A (en) Analogue switch circuit
JPS56149118A (en) Analog switch circuit using mis field effect transistor
JPS57164624A (en) Bridge type switching circuit