Multi-mode imager with pinned photo region photoreceptors

Details Multi-mode imager with pinned photo region photoreceptors Multi-mode imager with pinned photo region photoreceptors

2005-04-19

2005-04-19

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S214100, C348S241000, C348S308000

Reexamination Certificate

active

06881941

ABSTRACT:
An imager includes an array of imager cells coupled to a multi-mode controller. The multi-mode controller includes circuitry that implements several modes of operation, including a high-light mode, a low-light mode, and a Snap mode. The high-light mode provides charge accumulation in a photoreceptor potential well, a readout potential well, and a sense node potential well. The low-light mode provides charge accumulation in the photoreceptor potential well constrained by an integration potential well. The Snap mode of operation simultaneously transfers accumulated charge for a set of the imager cells to their sense nodes. In addition, the multi-mode controller may select one of a plurality of V+ integration voltages for setting up a selected charge capacity in one of the imager cells. Thus, the V+ integration voltage may be increased to provide charge capacity to address increased light levels. The imager thereby provides low noise characteristics and is configurable for a wide range of charge capacity, for a wide range of light levels, as compared to conventional imager cell implementations.

REFERENCES:
patent: 6166768 (2000-12-01), Fossum et al.
patent: 6320617 (2001-11-01), Gee et al.
patent: 6515702 (2003-02-01), Yadid-Pecht et al.

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