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JPS55121714A - Direct current amplification circuit - Google Patents

Direct current amplification circuit

Info

Publication number
JPS55121714A
JPS55121714A JP2925079A JP2925079A JPS55121714A JP S55121714 A JPS55121714 A JP S55121714A JP 2925079 A JP2925079 A JP 2925079A JP 2925079 A JP2925079 A JP 2925079A JP S55121714 A JPS55121714 A JP S55121714A
Authority
JP
Japan
Prior art keywords
fluctuation
self
heating
given
low voltage
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
JP2925079A
Other languages
Japanese (ja)
Inventor
Hisashi Ando
Susumu Kumamoto
Tsuguro Kawamoto
Hiroyuki Senchi
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.)
KYOWA DENGIYOU KK
Kyowa Electronic Instruments Co Ltd
Original Assignee
KYOWA DENGIYOU KK
Kyowa Electronic Instruments 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 KYOWA DENGIYOU KK, Kyowa Electronic Instruments Co Ltd filed Critical KYOWA DENGIYOU KK
Priority to JP2925079A priority Critical patent/JPS55121714A/en
Publication of JPS55121714A publication Critical patent/JPS55121714A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To ensure the accurate amplification by securing the automatic compensation to the potential fluctuation and also decreasing the zero point fluctuation due to the self-heating. CONSTITUTION:Power voltage BV of the Wheatstone bridge consisting of four sheets of strain gauges Rg1-Rg4 is switched alternately in two steps of the high and low voltage each. The subtraction is given to bridge output eE of the high voltage from output eE of the low voltage via automatic zero level compensating analog mem ories C1 and C2 plus analog subtractor circuit A2. Then the smoothing shaping is given to the square wave thus obtained and proportional to the mechanical strain, and as a result both the zero level fluctuation of DC amplifier A1 itself and the zero point fluctuation caused by the heat electromotive force contributing to the Wheatstone bridge circuit and the self-heating of the strain gauge can be eliminated.
JP2925079A 1979-03-12 1979-03-12 Direct current amplification circuit Pending JPS55121714A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2925079A JPS55121714A (en) 1979-03-12 1979-03-12 Direct current amplification circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2925079A JPS55121714A (en) 1979-03-12 1979-03-12 Direct current amplification circuit

Publications (1)

Publication Number Publication Date
JPS55121714A true JPS55121714A (en) 1980-09-19

Family

ID=12271012

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2925079A Pending JPS55121714A (en) 1979-03-12 1979-03-12 Direct current amplification circuit

Country Status (1)

Country Link
JP (1) JPS55121714A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2557400A1 (en) * 1983-12-21 1985-06-28 Facom DIRECT CURRENT DIFFERENTIAL AMPLIFIER ASSEMBLY, IN PARTICULAR FOR MEASURING SLOWLY VARIABLE LOW VOLTAGES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2557400A1 (en) * 1983-12-21 1985-06-28 Facom DIRECT CURRENT DIFFERENTIAL AMPLIFIER ASSEMBLY, IN PARTICULAR FOR MEASURING SLOWLY VARIABLE LOW VOLTAGES

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