JPS56154673A - Voltage-frequency converter - Google Patents

Voltage-frequency converter

Info

Publication number
JPS56154673A
JPS56154673A JP5750780A JP5750780A JPS56154673A JP S56154673 A JPS56154673 A JP S56154673A JP 5750780 A JP5750780 A JP 5750780A JP 5750780 A JP5750780 A JP 5750780A JP S56154673 A JPS56154673 A JP S56154673A
Authority
JP
Japan
Prior art keywords
operational amplifier
voltage
analog switches
offset voltage
integrates
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
JP5750780A
Other languages
Japanese (ja)
Inventor
Ryoji Gamo
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP5750780A priority Critical patent/JPS56154673A/en
Publication of JPS56154673A publication Critical patent/JPS56154673A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/252—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques using analogue/digital converters of the type with conversion of voltage or current into frequency and measuring of this frequency

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE:To correct the offset voltage of an operational amplifier and improve the linearity at a light load level by using two operational amplifiers and one comparator so that the operational amplifiers alternately perform integration and the correction of the offset voltage. CONSTITUTION:When analog switches S1-S8 are ON, and analog switches S11- S18 are OFF, a capacitor C2 is charged with the offset voltage of an operational amplifier A1. On the other hand, an operational amplifier A2 becomes an integrator and integrates an input signal es. When the integral voltage reaches eref, a comparator circuit A3 is inverted, and a flip-flop circuit FF is triggered. Consequently, the analog switches S1-S8 are simultaneously turned OFF, while the analog switches S11-S18 are simultaneously turned ON, so that the operational amplifier A1 integrates the input signal es. Thereby, the operational amplifier can correct its own offset voltage. Accordingly, a stable voltage-frequency conversion can be performed on even a signal of light load level.
JP5750780A 1980-04-30 1980-04-30 Voltage-frequency converter Pending JPS56154673A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5750780A JPS56154673A (en) 1980-04-30 1980-04-30 Voltage-frequency converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5750780A JPS56154673A (en) 1980-04-30 1980-04-30 Voltage-frequency converter

Publications (1)

Publication Number Publication Date
JPS56154673A true JPS56154673A (en) 1981-11-30

Family

ID=13057641

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5750780A Pending JPS56154673A (en) 1980-04-30 1980-04-30 Voltage-frequency converter

Country Status (1)

Country Link
JP (1) JPS56154673A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004097434A1 (en) * 2003-04-28 2004-11-11 Hamamatsu Photonics K.K. I/f conversion device and photo-detection device
WO2006006575A1 (en) * 2004-07-12 2006-01-19 Hamamatsu Photonics K.K. Photodetector
CN104181384A (en) * 2014-09-01 2014-12-03 苏州博众精工科技有限公司 Dual-integral direct-current voltage meter
CN111448464A (en) * 2017-12-09 2020-07-24 深圳市丹砂科技有限公司 Current sensor for biomedical measurements

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004097434A1 (en) * 2003-04-28 2004-11-11 Hamamatsu Photonics K.K. I/f conversion device and photo-detection device
CN100443904C (en) * 2003-04-28 2008-12-17 浜松光子学株式会社 I/F conversion device and photo-detection device
US7812877B2 (en) 2003-04-28 2010-10-12 Hamamatsu Photonics K.K. I/F conversion device and photo-detection device
KR101052398B1 (en) 2003-04-28 2011-07-28 하마마츠 포토닉스 가부시키가이샤 Ι / F converter and photodetector
WO2006006575A1 (en) * 2004-07-12 2006-01-19 Hamamatsu Photonics K.K. Photodetector
US7532044B2 (en) 2004-07-12 2009-05-12 Hamamatsu Photonics K.K. Photodetector
CN104181384A (en) * 2014-09-01 2014-12-03 苏州博众精工科技有限公司 Dual-integral direct-current voltage meter
CN111448464A (en) * 2017-12-09 2020-07-24 深圳市丹砂科技有限公司 Current sensor for biomedical measurements

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