Image processing system with a 4-T pixel and method thereof capable of reducing fixed pattern noise
Circuitry for reducing fixed pattern noise in an image processing system with a 4-T (4 transistors) pixel and a method thereof is proposed. The image processing system includes two voltage sources, two current sources, a 4-T pixel, a second portion of a linearized source follower, a ping pong memory, a PGA, and auto-zero circuitry. By coupling the auto-zero circuitry to the PGA, an open loop is formed to clamp the output of an op amp of the PGA to a stable reference when resetting the PGA so as to remove DC offsets at the output terminal of the op amp.
United Microelectronics Corp.
H H H
H04N H04N H04N
inventional inventional inventional
Jhy-Jyi Yuan-Che Chiao-Fu
Sze Lee Chang