Photosensor device and portable terminal unit having...

Details Photosensor device and portable terminal unit having... Photosensor device and portable terminal unit having...

2006-07-11

2006-07-11

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC, C330S308000, C327S514000

Reexamination Certificate

active

07075051

ABSTRACT:
A semiconductor photosensor device which outputs a detection result when a trigger signal is inputted, comprises: a photodiode current arithmetic circuit which is in an operating state regardless of whether before or after the input of the trigger signal, and which outputs a photocurrent generated by light irradiation; a first amplifier which is in an operating state regardless of whether before or after the input of the trigger signal, and which amplifier and outputs the output of the photodiode current arithmetic circuit; and a second amplifier which is in a non-operating state before the input of the trigger signal, wherein the second amplifier shifts to an operating state upon receiving the trigger signal, and amplifies and outputs the output of the first amplifier.

REFERENCES:
patent: 6348682 (2002-02-01), Lee
patent: 6455839 (2002-09-01), O'Connor et al.
patent: 2-165709 (1990-06-01), None
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patent: 9-247355 (1997-09-01), None
patent: 2002-217448 (2002-08-01), None
patent: 2003-125060 (2003-04-01), None
patent: WO 02/073956 (2002-09-01), None

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