High voltage reset method for increasing the dynamic range...

Details High voltage reset method for increasing the dynamic range... High voltage reset method for increasing the dynamic range...

2005-03-08

2005-03-08

Moe, Aung (Department: 2612)

Television

Camera, system and detail

Solid-state image sensor

Reexamination Certificate

active

06864920

ABSTRACT:
A circuit and method for increasing the dynamic range of CMOS image sensors designed with a thin gate oxide layer. The circuit includes a high voltage supply circuit and a high voltage level shifter circuit. The high voltage supply circuit is configured to supply a voltage to the shifter circuit. The voltage has a voltage level higher than the maximum supply voltage of the associated fabrication process. The shifter circuit is configured to output a high reset signal based on a reset signal generated to reset a pixel circuit of a pixel array. Instead of the reset signal, the high reset signal is coupled to a gate of the reset transistor in the pixel circuit. The high reset signal allows the reset transistor to maintain a gate to source potential less than the maximum supply voltage even when the high reset signal is greater than the maximum supply voltage.

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patent: 6369853 (2002-04-01), Merrill et al.
patent: 6642543 (2003-11-01), El Gamal et al.
patent: 6720592 (2004-04-01), Kindt et al.

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