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US RE45,094 E1Granted
Method of operating a CMOS APS pixel sensor
AssigneeRound Rock Research, LLC
InventorsVladimir Berezin, Alexander I. Krymski
Life of this patent
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Abstract
A method of operating a CMOS imager is presented wherein a reset transistor source/drain of a first pixel is biased with a first voltage source, a source follower transistor of a second pixel is biased with the same first voltage source, a reset transistor source/drain of the second pixel is biased with a second voltage source, and the first voltage source is dropped to ground during a reset of the second pixel.
Claims12
A method of operating a pixel circuit, comprising:
- biasing a reset transistor source/drain of a first pixel with a first voltage source on a first line;
- biasing a source follower transistor source/drain of a second pixel with the first voltage source on the first line;
- biasing a reset transistor source/drain of the second pixel with a second voltage source on a second line;
- during a reset of the second pixel, dropping the first voltage source to ground;
- and
- controlling the reset transistor of the first pixel by a signal pulsed on a third line.
3 more elements
A method of operating a CMOS imager pixel sensor circuit, comprising:
- biasing a reset transistor source/drain of a first pixel with a first voltage signal supplied to a first row of pixels;
- biasing a source follower transistor source/drain of a second pixel, associated with a second row of pixels that at least partially overlaps the first row of pixels, with a voltage source on a first line;
- biasing a reset transistor source/drain of the second pixel with a second voltage signal on a second line electrically isolated from the first line;
- during operation of the pixel circuit, lowering the first voltage signal;
- and
- controlling the reset transistor of the first pixel by a time-pulsed signal on a third line.
3 more elements
Dependencies are inferred from the claim text.