Photodetector including integration capacitance section and...

Details Photodetector including integration capacitance section and... Photodetector including integration capacitance section and...

2006-07-11

2006-07-11

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

Reexamination Certificate

active

07075050

ABSTRACT:
An integration circuit10comprises: an amplifier and an integration capacitance section arranged in parallel to each other between an input terminal and an output terminal; and capacitance value switching means for switching the capacitance value of the integration capacitance section into any one of Cf1through CfK; and inputs electric charge output from a photodiode PD, so as to accumulate the electric charge into the integration capacitance section, so as to output an integration voltage having a value corresponding to the amount of the accumulated electric charge. An A/D converter circuit20comprises reference voltage switching means for switching a reference voltage used in A/D conversion, into any one of Vref,1through Vref,L, and inputs the integration voltage output from the integration circuit10,so as to A/D-convert the integration voltage on the basis of the reference voltage switched and set to be by the reference voltage switching means, so as to output a digital value corresponding to the integration voltage.

REFERENCES:
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International Application No. PCT/JP02/05981 International Preliminary Examination Report (English Translation).

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