Correlated double sampling circuit and CMOS image sensor unit

Details Correlated double sampling circuit and CMOS image sensor unit Correlated double sampling circuit and CMOS image sensor unit

2008-05-23

2011-12-20

Choi, William (Department: 2873)

Television

Camera, system and detail

Solid-state image sensor

C348S241000, C348S300000, C348S308000

Reexamination Certificate

active

08081243

ABSTRACT:
Embodiments of the present invention provide a correlated double sampling (CDS) circuit and a CMOS image sensor unit using the CDS circuit. The CDS circuit shifts levels of sampled sensing signal and reset signal with equal amounts. Thus a voltage difference of the sampled sensing signal and the reset signal remains unchanged, and their levels may fall within a linear input range by adjusting their levels. Compared to a conventional CDS circuit, a gain of the CDS circuit provided by the embodiment of the present invention is not reduced, and thus a design complexity of a rear circuit thereof is lower, and an induced noise is relatively low. Furthermore, the CMOS image sensor unit using the CDS circuit provided by the embodiment also has these advantages.

REFERENCES:
patent: 5736886 (1998-04-01), Mangelsdorf et al.
patent: 5965871 (1999-10-01), Zhou et al.
patent: 6018364 (2000-01-01), Mangelsdorf
patent: 6421085 (2002-07-01), Xu
patent: 7133074 (2006-11-01), Brehmer et al.
patent: 2003/0001075 (2003-01-01), Mukherjee et al.
D. Litwiller “CCD vs. CMOS: Facts and Fiction”, Photonics Spectra, Jan. 2001, p1-4.
“Office Action of Taiwan Counterpart Application”, issued on Aug. 30, 2011, p1-p12, in which the listed references were cited.

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