CMOS active pixel sensor with a sample and hold circuit...

Details CMOS active pixel sensor with a sample and hold circuit... CMOS active pixel sensor with a sample and hold circuit...

2005-03-01

2005-03-01

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C348S241000, C348S250000

Reexamination Certificate

active

06861634

ABSTRACT:
An CMOS active pixel sensor (APS) imaging system include circuitry to compensate for different analog offset levels from the CMOS pixel array. More specifically, the compensation is performed in the analog (charge) domain. A digital correction value, which may be measured as part of the operation or testing of the CMOS APS system, is provided to a offset correction block circuit, to generate an analog electrical signal. The analog electrical signal is supplied to a sample-and-hold circuit including a charge amplifier. The signal read from the pixel array, after conditioning through an analog signal chain, is also supplied to the charge amplifier, which has a linear transfer function and outputs the compensated signal.

REFERENCES:
patent: 5579007 (1996-11-01), Paul
patent: 5841126 (1998-11-01), Fossum et al.
patent: 5920345 (1999-07-01), Sauer
patent: 5969758 (1999-10-01), Sauer et al.
patent: 6222175 (2001-04-01), Krymski
patent: 6307195 (2001-10-01), Guidash
patent: 6320616 (2001-11-01), Sauer

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