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:
Apr. 24, 2001
Filed:
Mar. 08, 1999
Alexander J. Krymski, Montrose, CA (US);
Photobit Corporation, Pasadena, CA (US);
Abstract
A CMOS imager includes an array of CMOS active pixel sensors and multiple column readout circuits each of which is associated with a respective column of sensors in the array and can perform correlated double sampling of values from a sensor in the respective column. Each column readout circuit also includes a crowbar switch which selectively can be enabled to force the stored values to an operational amplifier-based charge sensing circuit via a pair of buses. The operational amplifier-based charge sensing circuit, which includes a pair of switched integrators each of which is coupled to one of the buses, provides a differential output based on the values stored by a selected one of the column readout circuits.