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:
Mar. 08, 2005
Filed:
Jun. 21, 2001
Paul Hua, Ottawa, CA;
Paul Hua, Ottawa, CA;
Symagery Microsystems Inc., Ottawa, CA;
Abstract
An output signal of an image sensor pixel, which substantially avoids fixed pattern noise contributed by the readout circuitry, is provided. The apparatus, which is used to provide an output signal that is a function of the difference between two sample signals Vand V, includes first and second capacitor elements that are coupled together at a common terminal. A reference voltage Vis first applied to the capacitor elements, then a first sample signal Vfrom the image sensor pixel is applied to the first capacitor element producing a charge that is transferred to the second capacitor element. A second sample signal Vfrom the image sensor pixel is then applied to the first capacitor element producing a charge that is also transferred to the first capacitor element such that V=V−V+V.