JPS54159246A - Resistance value output circuit - Google Patents

Resistance value output circuit

Info

Publication number
JPS54159246A
JPS54159246A JP6769978A JP6769978A JPS54159246A JP S54159246 A JPS54159246 A JP S54159246A JP 6769978 A JP6769978 A JP 6769978A JP 6769978 A JP6769978 A JP 6769978A JP S54159246 A JPS54159246 A JP S54159246A
Authority
JP
Japan
Prior art keywords
output
resistance value
impedance element
operational amplifier
semiconductor switch
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
JP6769978A
Other languages
Japanese (ja)
Other versions
JPS6122886B2 (en
Inventor
Takashi Sase
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 JP6769978A priority Critical patent/JPS54159246A/en
Publication of JPS54159246A publication Critical patent/JPS54159246A/en
Publication of JPS6122886B2 publication Critical patent/JPS6122886B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To achieve the improvement in the accuracy of the resistance value output circuit by converting the output of an operational amplifier once to time width signal then fetching the output through an insulation type buffer thereby making ON-OFF controlling of a semiconductor switch.
CONSTITUTION: When input voltage Ei is applied to an operational amplifier 20 through an impedance element 450, the operational amplifier 20 converts the output voltage to a pulse signal in a V/T conversion circuit 30 so that the potential at its input addition point becomes 0 and a semiconductor switch 10 is switched by this, then the resistance value of an impedance element 450 becomes value corresponding to the input voltage. On the other hand, the controlled pulse signal of the V/T conversion circuit 30 is also applied to an impedance element 451 to switch a semiconductor switch 40 in the similar manner as with the impedance element 450 and therefore the output resistance value proportional to the input voltage Ei is obtainable at output terminals 1, 2.
COPYRIGHT: (C)1979,JPO&Japio
JP6769978A 1978-06-07 1978-06-07 Resistance value output circuit Granted JPS54159246A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6769978A JPS54159246A (en) 1978-06-07 1978-06-07 Resistance value output circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6769978A JPS54159246A (en) 1978-06-07 1978-06-07 Resistance value output circuit

Publications (2)

Publication Number Publication Date
JPS54159246A true JPS54159246A (en) 1979-12-15
JPS6122886B2 JPS6122886B2 (en) 1986-06-03

Family

ID=13352454

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6769978A Granted JPS54159246A (en) 1978-06-07 1978-06-07 Resistance value output circuit

Country Status (1)

Country Link
JP (1) JPS54159246A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT388020B (en) * 1986-08-01 1989-04-25 Interprofil Gfk Gmbh WING OR FLOOR FRAME AND METHOD FOR PRODUCING SAME

Also Published As

Publication number Publication date
JPS6122886B2 (en) 1986-06-03

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