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:
Dec. 26, 2006
Filed:
Feb. 08, 2005
Kuniyuki Tani, Ogaki, JP;
Atsushi Wada, Ogaki, JP;
Shigeto Kobayashi, Gifu, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A first amplifier circuit samples and holds an input analog signal and outputs the same to a subtracting circuit. An AD converter circuit converts the input analog signal into a digital value so as to retrieve a predetermined number of bits. A DA converter circuit converts the digital value derived from conversion by the AD converter circuit into an analog value. A subtracter circuit subtracts an output analog signal from the DA converter circuit from the analog signal input via a first switch or the first amplifier circuit. A second amplifier circuit amplifies an output analog signal from the subtracter circuit by a gain of 2 and outputs the amplified signal. An input switching circuit controls the order of inputs, i.e. the input analog signal and a reference voltage, to voltage comparison elements constituting the Ad converter circuit.