Method and apparatus for reducing kTC noise in an active...

Details Method and apparatus for reducing kTC noise in an active... Method and apparatus for reducing kTC noise in an active...

2005-07-12

2005-07-12

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C348S308000, C257S292000

Reexamination Certificate

active

06917027

ABSTRACT:
An image sensing device, such as a CMOS Active Pixel Sensor (APS) device, includes an array of pixels. Each pixel includes a reset transistor connected between a photodetector and a supply voltage. In a readout operation, a signal integrated onto the photodetector is sampled onto a holding capacitor. The photodetector is then reset in a reference reset operation during which the photodetector is clamped to the supply voltage. A reset signal is sampled from the pixel while the photodetector is clamped to the supply voltage. Reset, or kTC, noise in the reset signal may be filtered by a source-follower transistor in the pixel.

REFERENCES:
patent: 5841126 (1998-11-01), Fossum et al.
patent: 6133862 (2000-10-01), Dhuse et al.
patent: 6320617 (2001-11-01), Gee et al.
patent: 2002/0080263 (2002-06-01), Krymski

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