Image sensor with active reset and randomly addressable pixels

Details Image sensor with active reset and randomly addressable pixels Image sensor with active reset and randomly addressable pixels

2007-09-25

2007-09-25

Vu, Ngoc-Yen (Department: 2622)

Television

Camera, system and detail

Solid-state image sensor

C250S208100

Reexamination Certificate

active

10639227

ABSTRACT:
An imaging array having one or more columns of pixels is disclosed. Each pixel includes a photodiode including first and second terminals, a local reset circuit for connecting the first terminal to a column reset line; and a buffer circuit for selectively connecting the first terminal to a column bit line in response to a word select signal. Each column also includes a column reset circuit having an operational amplifier and a low-pass filter. The operational amplifier has a first input connected to the column bit line for that column and a second input connected to a reset signal generator that generates a reset signal during a reset cycle. The output of the operational amplifier is connected to the column reset line during the reset cycle. In one embodiment, the gain of the operational amplifier and the passband of the low-pass filter are varied during the reset cycle.

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