The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 30, 2011
Filed:
Sep. 25, 2008
Applicants:
Yuan-che Lee, Taichung, TW;
Jhy-jyi Sze, Tainan, TW;
Chiao-fu Chang, Taichung, TW;
Inventors:
Assignee:
United Microelectronics Corp., Science-Based Industrial Park, Hsin-Chu, TW;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H04N 3/14 (2006.01); H04N 5/335 (2006.01);
U.S. Cl.
CPC ...
Abstract
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.