Signal processing circuit, image sensor IC, and signal...

Details Signal processing circuit, image sensor IC, and signal... Signal processing circuit, image sensor IC, and signal...

2007-03-13

2007-03-13

Epps, Georgia (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C348S302000

Reexamination Certificate

active

10784494

ABSTRACT:
A signal processing circuit has a sample/hold circuit for sampling an input signal comprised of a first signal and a second signal and for holding the first signal. The first signal comprises an optical signal obtained due to storage of electric charges generated due to light incident upon a photoelectric converter, and the second signal comprises a reference signal obtained due to resetting of the photoelectric converter. A subtracter receives an output signal of the sample/hold circuit and the input signal and obtains a difference between the output signal of the sample/hold circuit and the input signal. A voltage clamp circuit clamps a part or all of an output signal from the subtracter.

REFERENCES:
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patent: 5949483 (1999-09-01), Fossum et al.
patent: 5966172 (1999-10-01), Tsunai
patent: 6088057 (2000-07-01), Hieda
patent: 6320616 (2001-11-01), Sauer
patent: 6580465 (2003-06-01), Sato
patent: 6587143 (2003-07-01), Boisvert
patent: 2003/0146369 (2003-08-01), Kokubun

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