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:
Nov. 08, 2011
Filed:
Nov. 21, 2008
Hirokazu Sawada, Tsuchiura, JP;
Jose Tejada, Tsuchiura, JP;
Hirokazu Sawada, Tsuchiura, JP;
Jose Tejada, Tsuchiura, JP;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
This invention improves linearity of a solid-state image pickup device beyond that of the prior art source follower to improve image quality. The image pickup device has plural pixels disposed in an array. Each pixel includes: a photodiode (PD); a transfer transistor (Tr); a floating diffusion (FD); and an amplification transistor (Tr). A compensating circuit has an amplifier (AP) receiving the output of the amplification transistor (Tr), and a compensating transistor (M) matched to the pixel amplification transistor (Tr). Compensation is provided using negative feedback in the amplifier (AP).