JPS641014A - Voltage/current converting circuit - Google Patents

Voltage/current converting circuit

Info

Publication number
JPS641014A
JPS641014A JP15545787A JP15545787A JPS641014A JP S641014 A JPS641014 A JP S641014A JP 15545787 A JP15545787 A JP 15545787A JP 15545787 A JP15545787 A JP 15545787A JP S641014 A JPS641014 A JP S641014A
Authority
JP
Japan
Prior art keywords
voltage
resistance
amplifier
ref
supplied
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
JP15545787A
Other languages
Japanese (ja)
Other versions
JPH011014A (en
Inventor
Kunio Seki
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 JP62-155457A priority Critical patent/JPH011014A/en
Priority claimed from JP62-155457A external-priority patent/JPH011014A/en
Publication of JPS641014A publication Critical patent/JPS641014A/en
Publication of JPH011014A publication Critical patent/JPH011014A/en
Pending legal-status Critical Current

Links

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  • Control Of Voltage And Current In General (AREA)

Abstract

PURPOSE: To drive a load circuit with a constant current by providing a resistance, which detects the current flowing to the load circuit, between the output terminal of a first inverting amplifier to which a control voltage is supplied and the output terminal of a second inverting amplifier to which the output voltage of the first inverting amplifier is supplied and controlling the gain of the first amplifier by the variation of the current.
CONSTITUTION: A control voltage Vctl is supplied to the inverted input terminal of a first inverting amplifier 1 through an input resistance R1, and a reference voltage Vref is set to the non-inverted input terminal through a resistance R3. A resistance R2 is a feedback resistance, and a gain Av of the amplifier 1 is determined in accordance with Av=-R2/R1(Vctl-Vref). An output voltage V01 of the amplifier 1 is supplied to a second inverting amplifier 2 through a resistance Rs, and the gain of the amplifier 2 is determined in accordance with Av=-Rs/R3 (V01-Vref) because R3 is the feedback resistance. In case the voltage Vctl is lower than the voltage Vref, the polarity of an output current I0 is changed to the opposite polarity and a voltage drop Vs determined by I0.Rs is generated between both ends of the current detecting resistance Rs, and the reference voltage of the amplifier 1 is determined by Vref+Vs.
COPYRIGHT: (C)1989,JPO&Japio
JP62-155457A 1987-06-24 Voltage-current conversion circuit Pending JPH011014A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62-155457A JPH011014A (en) 1987-06-24 Voltage-current conversion circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62-155457A JPH011014A (en) 1987-06-24 Voltage-current conversion circuit

Publications (2)

Publication Number Publication Date
JPS641014A true JPS641014A (en) 1989-01-05
JPH011014A JPH011014A (en) 1989-01-05

Family

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015156599A (en) * 2014-02-21 2015-08-27 ルネサスエレクトロニクス株式会社 drive circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015156599A (en) * 2014-02-21 2015-08-27 ルネサスエレクトロニクス株式会社 drive circuit

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