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:
Jul. 01, 2008
Filed:
Apr. 20, 2006
Junichi Naka, Osaka, JP;
Koji Sushihara, Nara, JP;
Junichi Naka, Osaka, JP;
Koji Sushihara, Nara, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In an A/D converter, each preampincludes a preamp gain adjusting circuit. The preamp gain adjusting circuitsuppresses the gain of the preampand restricts a positive-negative output potential difference of the preamp only when the positive-negative output potential difference of the preampexceeds a reference potential. Accordingly, in the case where the frequency of an input signal to the A/D converter is high, even when the gain of the preamp is increased due to fabrication process variation, temperature variation or supply voltage variation, output strain of the preamp is minimally caused, and the characteristic degradation of the A/D converter can be suppressed.