Photodector including photodiodes having improved dynamic...

Details Photodector including photodiodes having improved dynamic... Photodector including photodiodes having improved dynamic...

2003-12-25

2008-10-28

Luu, Thanh X (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC, C250S2140AG

Reexamination Certificate

active

07442911

ABSTRACT:
The present invention aims at providing a photodetector which can improve each of the dynamic range, S/N ratio, and speed of light detection. A photodiode PDm,ngenerates electric charges by an amount corresponding to the incident light intensity, and accumulates thus generated electric charges into a junction capacitance part. An electric charge amount level determining circuit10m,ndetermines the level of amount of electric charges generated by the photodiode PDm,nand accumulated in the junction capacitance part. In an integrating circuit20m, the capacitance value of an integral capacitance part21is set according to the result of electric charge amount level determination, the electric charges inputted from the photodiode PDm,nby way of a switch SW1m,nare accumulated into the integral capacitance part21,and a voltage V20corresponding to the amount of thus accumulated electric charges is outputted. The voltage Vinpfed to a non-inverting input terminal of an amplifier A in the integrating circuit20mis set greater in a second period during which the integral capacitance part21of the integrating circuit20maccumulates electric charges than in a first period during which the junction capacitance part of the photodiode PDm,naccumulates electric charges.

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