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:
Feb. 22, 2011
Filed:
Mar. 10, 2009
Takanobu Ambo, Tokyo, JP;
Hirokazu Shimizu, Tokyo, JP;
Takanobu Ambo, Tokyo, JP;
Hirokazu Shimizu, Tokyo, JP;
Renesas Electronics Corporation, Kawasaki, JP;
Abstract
For a semiconductor integrated circuit device such as AFE including a CDS amplifier, in case of excessive signal input to the CDS amplifier, a technique capable of preventing the response characteristic of the CDS amplifier from deteriorating is provided. In the AFE including the CDS amplifier, the CDS amplifier is prevented from becoming saturated by detecting an excessive signal input and triggering the reset of the CDS amplifier. Thereby, no abnormality occurs in the transient response of the CDS amplifier. Specifically, comparison of input signals to the CDS amplifier is performed by a comparator and the CDS amplifier is reset by a reset circuit (by fixing the input terminals of the CDS amplifier to a constant voltage) in case of excessive signal input, so that the CDS amplifier will not amplify excessive signal inputs.