JPS5651609A - Input circuit - Google Patents

Input circuit

Info

Publication number
JPS5651609A
JPS5651609A JP12872279A JP12872279A JPS5651609A JP S5651609 A JPS5651609 A JP S5651609A JP 12872279 A JP12872279 A JP 12872279A JP 12872279 A JP12872279 A JP 12872279A JP S5651609 A JPS5651609 A JP S5651609A
Authority
JP
Japan
Prior art keywords
operational amplifier
resistor
circuit
phase noise
connects
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
JP12872279A
Other languages
Japanese (ja)
Other versions
JPH0118384B2 (en
Inventor
Tadashi Azegami
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.)
Yokogawa Electric Corp
Original Assignee
Hokushin Electric Works Ltd
Yokogawa Hokushin Electric 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 Hokushin Electric Works Ltd, Yokogawa Hokushin Electric Corp filed Critical Hokushin Electric Works Ltd
Priority to JP12872279A priority Critical patent/JPS5651609A/en
Publication of JPS5651609A publication Critical patent/JPS5651609A/en
Publication of JPH0118384B2 publication Critical patent/JPH0118384B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

PURPOSE: To make it possible to obtain easily a high in-phase noise removal ratio without reference to the precision of a resistance value, by providing a specific switch circuit that connects the output side of an operational amplifier to the control input side of a switch element.
CONSTITUTION: Switch circuit 21 that connects the output side of operational amplifier 28 to the control input side of switch element 29 as shown in the figure is provided and one terminal of element 29 is connected to the reference potential point via output resistor 27. For example, the input circuit that uses thermocouple 31 as an input signal source is constituted in the figure so as to obtain voltage eo across resistor 27 in proportion to input signal voltage ei. In this circuit, if an in-phase noise from noise source 32 is to change electric current flowing through FET29, the current change is suppressed under the control that provides the zero balance of operational amplifier 28 and current i0 flowing through resistor 26 holds itself constant without being influenced by the in-phase noise.
COPYRIGHT: (C)1981,JPO&Japio
JP12872279A 1979-10-04 1979-10-04 Input circuit Granted JPS5651609A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12872279A JPS5651609A (en) 1979-10-04 1979-10-04 Input circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12872279A JPS5651609A (en) 1979-10-04 1979-10-04 Input circuit

Publications (2)

Publication Number Publication Date
JPS5651609A true JPS5651609A (en) 1981-05-09
JPH0118384B2 JPH0118384B2 (en) 1989-04-05

Family

ID=14991809

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12872279A Granted JPS5651609A (en) 1979-10-04 1979-10-04 Input circuit

Country Status (1)

Country Link
JP (1) JPS5651609A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63295967A (en) * 1987-05-28 1988-12-02 Rion Co Ltd Physical quantity detector
CN102879015A (en) * 2011-07-13 2013-01-16 艾尔默斯半导体股份公司 Device for ambient light compensation for optical sensors exposed to both useful light and ambient light

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63295967A (en) * 1987-05-28 1988-12-02 Rion Co Ltd Physical quantity detector
CN102879015A (en) * 2011-07-13 2013-01-16 艾尔默斯半导体股份公司 Device for ambient light compensation for optical sensors exposed to both useful light and ambient light
CN102879015B (en) * 2011-07-13 2016-11-23 艾尔默斯半导体股份公司 It is exposed to the device having the ambient light compensation using up the optical pickocff with ambient light

Also Published As

Publication number Publication date
JPH0118384B2 (en) 1989-04-05

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