Ultra low noise CMOS imager

Details Ultra low noise CMOS imager Ultra low noise CMOS imager

2011-04-19

2011-04-19

Jerabek, Kelly L (Department: 2622)

Television

Camera, system and detail

Solid-state image sensor

C348S302000, C250S208100

Reexamination Certificate

active

07929035

ABSTRACT:
A column buffer for use with a pixel cell array includes an amplifier coupled to three read-out circuits in parallel providing a signal corresponding to accumulated photon-generated charge in a pixel cell plus noise, a reset level plus noise, and a pedestal level, respectively. These three signals are used to generate an ultra-low noise signal Di=Si−Pi-1−G*(Ri−Ri-1), wherein S is the sampled signal, P is the pedestal level, R is the reset level, and G is a gain associated with a pixel cell, and wherein i is a frame number greater than 0. The three signals can be read-out simultaneously. In another embodiment, the three signals are obtained from a column buffer having only one output. In this case, the signals are read-out sequentially.

REFERENCES:
patent: 5625414 (1997-04-01), Manning
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patent: 6809767 (2004-10-01), Kozlowski et al.
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patent: 7154548 (2006-12-01), Liu
patent: 2008/0002043 (2008-01-01), Inoue et al.
Mendis et al., A 128 x 128 CMOS Active Pixel Image Sensor for Highly Integrated Imgaing Systems, IEEE, 1993, pp. 583-586.

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