JPS56104321A - Reference voltage generating circuit - Google Patents

Reference voltage generating circuit

Info

Publication number
JPS56104321A
JPS56104321A JP568380A JP568380A JPS56104321A JP S56104321 A JPS56104321 A JP S56104321A JP 568380 A JP568380 A JP 568380A JP 568380 A JP568380 A JP 568380A JP S56104321 A JPS56104321 A JP S56104321A
Authority
JP
Japan
Prior art keywords
reference voltage
temperature coefficient
resistance
diode
input
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
JP568380A
Other languages
Japanese (ja)
Inventor
Koichi Sato
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 JP568380A priority Critical patent/JPS56104321A/en
Publication of JPS56104321A publication Critical patent/JPS56104321A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/081—Analogue circuits

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Exposure Control For Cameras (AREA)
  • Indication In Cameras, And Counting Of Exposures (AREA)

Abstract

PURPOSE:To generate a reference voltage having a large temperature coefficient, by amplifying a voltage, given a temperature coefficient by making use of a diode, by using an operational amplifier. CONSTITUTION:The inverting input (-) of operational amplifier 1 is provided with input resistance R1, feedback resistance R2 is connected between the inverting input (-) and output, and forward diode D1 is connected in series to input resistance R1 to apply voltage Vr stabilized through temperature compensation. Further, constant voltge V0 generated by dividing stabilized voltage Vr by resistances R3 and R4 is applied to noninverting input (+) of operational amplifying circuit 1 to develop reference voltage Vref at the output. Output reference voltage Vref can be found by solving equation I, where the forward voltage of diode D1 is denoted as VP. The temperature coefficient of reference voltage Vref can be set to a value multiplied by R2/R1 times. Consequently, a random large temperature coefficient can be obtained by properly setting the ratio of resistance R2/R1.
JP568380A 1980-01-23 1980-01-23 Reference voltage generating circuit Pending JPS56104321A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP568380A JPS56104321A (en) 1980-01-23 1980-01-23 Reference voltage generating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP568380A JPS56104321A (en) 1980-01-23 1980-01-23 Reference voltage generating circuit

Publications (1)

Publication Number Publication Date
JPS56104321A true JPS56104321A (en) 1981-08-20

Family

ID=11617888

Family Applications (1)

Application Number Title Priority Date Filing Date
JP568380A Pending JPS56104321A (en) 1980-01-23 1980-01-23 Reference voltage generating circuit

Country Status (1)

Country Link
JP (1) JPS56104321A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220022A (en) * 1975-08-08 1977-02-15 Canon Inc Exposure control device for the camera

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220022A (en) * 1975-08-08 1977-02-15 Canon Inc Exposure control device for the camera

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