JPS6439175A - Temperature compensating circuit for photodetector - Google Patents

Temperature compensating circuit for photodetector

Info

Publication number
JPS6439175A
JPS6439175A JP62194404A JP19440487A JPS6439175A JP S6439175 A JPS6439175 A JP S6439175A JP 62194404 A JP62194404 A JP 62194404A JP 19440487 A JP19440487 A JP 19440487A JP S6439175 A JPS6439175 A JP S6439175A
Authority
JP
Japan
Prior art keywords
output
signal
cmd
temperature
current
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
JP62194404A
Other languages
Japanese (ja)
Inventor
Fukashi Yoshizawa
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.)
Olympus Corp
Original Assignee
Olympus Optical Co 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP62194404A priority Critical patent/JPS6439175A/en
Publication of JPS6439175A publication Critical patent/JPS6439175A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To obtain the output signal of an extremely stable photodetector having no dependence on the temperature change, by changing the reading potential of light receiving photodetector element in response to the change due to the temperature of the output current of a reference photodetector which is shielded from the light. CONSTITUTION:The signal current Iref of a reference CMD 12 shielded from the light undergoes the current/voltage conversion via an amplifier 13 received the feedback with an impedance 14 for output of the reference voltage Vref. This output is inputted to a logalithm compression circuit 20 and the compression output of the circuit 20 serves as the signal Vc to control the reading potential of a receiving CMD 11. When the temperature changes by T, the current Iref of the CMD 12 is changed to Iref2 from Iref1. In such a case, the change Vc of the signal Vc is equal to a logarithm of Iref2/Iref1. Then the CMD 11 is driven by the output signal phiG2 of a CMD 11 drive signal generating circuit 22 which outputs the reading potential in response to the change Vc. Thus a signal current Isig having no dependence on the temperature is obtained. This current Isig is applied to an amplifier 15 fed back with an impedance 16. Thus the output voltage Vout having no dependence on the temperature is obtained.
JP62194404A 1987-08-05 1987-08-05 Temperature compensating circuit for photodetector Pending JPS6439175A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62194404A JPS6439175A (en) 1987-08-05 1987-08-05 Temperature compensating circuit for photodetector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62194404A JPS6439175A (en) 1987-08-05 1987-08-05 Temperature compensating circuit for photodetector

Publications (1)

Publication Number Publication Date
JPS6439175A true JPS6439175A (en) 1989-02-09

Family

ID=16324039

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62194404A Pending JPS6439175A (en) 1987-08-05 1987-08-05 Temperature compensating circuit for photodetector

Country Status (1)

Country Link
JP (1) JPS6439175A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3041223A1 (en) * 2015-01-05 2016-07-06 Ricoh Company, Ltd. Photoelectric conversion device, image generation device, and method of correcting output of photoelectric conversion device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3041223A1 (en) * 2015-01-05 2016-07-06 Ricoh Company, Ltd. Photoelectric conversion device, image generation device, and method of correcting output of photoelectric conversion device
CN105828002A (en) * 2015-01-05 2016-08-03 株式会社理光 Photoelectric conversion device, image generation device, and method of correcting output of photoelectric conversion device
US10078010B2 (en) 2015-01-05 2018-09-18 Ricoh Company, Ltd. Photoelectric conversion device, image generation device, and method of correcting output of photoelectric conversion device

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