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. 03, 1998
Filed:
Oct. 03, 1995
Applicant:
Inventors:
Tai-Ching Shyu, Cupertino, CA (US);
Datong Chen, Fremont, CA (US);
Assignee:
OmniVision Technologies Inc., San Jose, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
348300 ; 348241 ; 330-9 ;
Abstract
A charge amplifier with DC offset cancelling for use in a pixel element of an MOS image sensor is disclosed. The charge amplifier can be manufactured using a standard CMOS single polycrystalline process, making it much more cost effective than prior art designs. The charge amplifier includes an operational amplifier, a source capacitor, a series capacitor, and a feedback capacitor. The source capacitor holds the input signal. The output of the operational amplifier provides the output signal. Switches control the routing of the signal flow from the source capacitor, the series capacitor, and the feedback capacitor.