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. 30, 2014
Filed:
Aug. 01, 2012
Masao Takayama, Osaka, JP;
Kazuo Matsukawa, Osaka, JP;
Masao Takayama, Osaka, JP;
Kazuo Matsukawa, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A comparator offset correction device opens an open switchand closes a short-circuit switchin offset correction of a comparator. In this state, a controllerallows the comparatorto repeat, more than once, the operation of comparing reference voltagesinput to two input terminals with each other. The filteroutputs a frequency signal obtained by smoothing a plurality of comparison results. Based on the frequency signal from the filter, the controlleroutputs a threshold value control signal to the comparatorso that the ratio of a high-level voltage to a low-level voltage in the results of the comparison in the comparatoris 50%. Thus, even when a current which will be input may differ from a current which is currently input due to, for example, the influence of noise, the threshold value offset amount is normally corrected.