JPS57194322A - Photometric amplifier - Google Patents

Photometric amplifier

Info

Publication number
JPS57194322A
JPS57194322A JP7922281A JP7922281A JPS57194322A JP S57194322 A JPS57194322 A JP S57194322A JP 7922281 A JP7922281 A JP 7922281A JP 7922281 A JP7922281 A JP 7922281A JP S57194322 A JPS57194322 A JP S57194322A
Authority
JP
Japan
Prior art keywords
input terminal
amplifier
operational amplifier
current
output 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
JP7922281A
Other languages
Japanese (ja)
Inventor
Junichi Mameta
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 JP7922281A priority Critical patent/JPS57194322A/en
Publication of JPS57194322A publication Critical patent/JPS57194322A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/44—Electric circuits

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

PURPOSE:To obtain a high-precision photometric amplifier by the extremely simple constitution wherein a bias voltage VB is applied to the uninverted input terminal (+) of an operational amplifier OP. CONSTITUTION:A photodiode PD biased to zero is provided between the uninverted input terminal (+) and inverted input terminal (-) of an operational amplifier OP. Further, a diode D for generating a logarithmically compressed output voltage VOUT' for a photocurrent IP is provided forwardly between said inverted input terminal (-) and an output terminal. Said output voltage VOUT' is applied to the base of an npn transistor (TR) Q1, which generates a current signal at its collector by logarithmic expansion. The current mirror circuit composed of pnp TRs Q2 and Q3 outputs a current I.
JP7922281A 1981-05-27 1981-05-27 Photometric amplifier Pending JPS57194322A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7922281A JPS57194322A (en) 1981-05-27 1981-05-27 Photometric amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7922281A JPS57194322A (en) 1981-05-27 1981-05-27 Photometric amplifier

Publications (1)

Publication Number Publication Date
JPS57194322A true JPS57194322A (en) 1982-11-29

Family

ID=13683882

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7922281A Pending JPS57194322A (en) 1981-05-27 1981-05-27 Photometric amplifier

Country Status (1)

Country Link
JP (1) JPS57194322A (en)

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