JPS6475926A - Photoelectric conversion circuit - Google Patents
Photoelectric conversion circuitInfo
- 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
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.
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) |
-
1987
- 1987-09-17 JP JP62233543A patent/JPS6475926A/en active Pending
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