Title:
PHOTODETECTING CIRCUIT AND PHOTOCURRENT MEASUREMENT METHOD OF LIGHT RECEIVER AND LIGHT RECEIVING ELEMENT
Document Type and Number:
Japanese Patent JP2014220748
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To measure photocurrent of a light receiving element with high accuracy.SOLUTION: A photodetecting circuit 100 of the present embodiment comprises: operational amplifiers 62 which are provided individually and correspondingly to a plurality of light-receiving elements 40 provided on a common semiconductor substrate 42 and each have an inverting input terminal 64a to which a cathode of the light receiving element 40 is connected and a non-inverting input terminal 64b to which a voltage applied to the light-receiving element 40 is supplied; resistances 68 each connected to between an output terminal 66 and the inverting input terminal 64a of each of the plurality of operational amplifiers 62; and a terminal 70 which is provided at least on the inverting input terminal 64a side between both ends of the resistance 68, and to which a measuring instrument 69 for measuring photocurrent of the light-receiving element 40 is connected.
Inventors:
TATEIWA YOSHIHIRO
Application Number:
JP2013100339A
Publication Date:
November 20, 2014
Filing Date:
May 10, 2013
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES
International Classes:
H04B10/07; H01L31/10; H04B10/61
Attorney, Agent or Firm:
Shuhei Katayama
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