JPS6475926A - Photoelectric conversion circuit - Google Patents

Photoelectric conversion circuit

Info

Publication number
JPS6475926A
JPS6475926A JP62233543A JP23354387A JPS6475926A JP S6475926 A JPS6475926 A JP S6475926A JP 62233543 A JP62233543 A JP 62233543A JP 23354387 A JP23354387 A JP 23354387A JP S6475926 A JPS6475926 A JP S6475926A
Authority
JP
Japan
Prior art keywords
current
photocurrent
photodiode
differential amplifier
transistor
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
JP62233543A
Other languages
Japanese (ja)
Inventor
Koji Shinomiya
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP62233543A priority Critical patent/JPS6475926A/en
Publication of JPS6475926A publication Critical patent/JPS6475926A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To improve output accuracy, by outputting the difference current between the photocurrent, which is generated in a first photodiode, and the photocurrent, which is generated in a second photodiode, as the voltage or the current from a differential amplifier. CONSTITUTION:The photocurrent from a photodiode 11 is made to flow to the output of a differential amplifier 1 as the collector current of a transistor 111. The transistors 111, 112 and 113 are operated as a current mirror circuit. Subtraction is performed and the current correlated to the photocurrent is obtained. Then the collector current of the transistor 112 is merged with the photocurrent of a photodiode 21. The current difference is outputted A (1) as a voltage through a differential amplifier 2 and a compressing diode 22. The collector current of the transistor is merged with the photocurrent of a photodiode 31. The current difference is outputted B (2) as a voltage through a differential amplifier 3 and a compressing diode 32.
JP62233543A 1987-09-17 1987-09-17 Photoelectric conversion circuit Pending JPS6475926A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62233543A JPS6475926A (en) 1987-09-17 1987-09-17 Photoelectric conversion circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62233543A JPS6475926A (en) 1987-09-17 1987-09-17 Photoelectric conversion circuit

Publications (1)

Publication Number Publication Date
JPS6475926A true JPS6475926A (en) 1989-03-22

Family

ID=16956703

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62233543A Pending JPS6475926A (en) 1987-09-17 1987-09-17 Photoelectric conversion circuit

Country Status (1)

Country Link
JP (1) JPS6475926A (en)

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