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. 06, 2010
Filed:
Jan. 22, 2009
Seiichiro Sasaki, Saitama, JP;
Seiichiro Sasaki, Saitama, JP;
Oki Semiconductor Co., Ltd., Tokyo, JP;
Abstract
In a pipelined analog-to-digital (AD) converter, if logically incongruent signals Sand Sare output from an AD converter section of a converter stage of the AD converter, a digital-to-analog converter (DAC) section is to be prevented from erroneously operating. When a logically incongruent combination of signals Sand S, such as S='H' and S='L', is output from comparators that compare an input voltage VI to reference voltages +REF/4 and −REF/4, an encoder outputs a signal corresponding to a normal signal combination (S=“L” and S=“H”) to generate signals X, Y and Z that control switches of the DAC section. This eliminates the risk that the switches shall be turned on simultaneously, thus preventing the erroneous operation of the DAC section.