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:
Sep. 14, 2010
Filed:
Oct. 23, 2007
Tomohiro Ogawa, Osaka, JP;
Heiji Ikoma, Nara, JP;
Tomohiro Ogawa, Osaka, JP;
Heiji Ikoma, Nara, JP;
Panasonic Corporation, Osaka, JP;
Abstract
In a current switch circuit A used for a current steering D/A converter, a current switch basic circuitincludes first and second transistors Trand Trincluded in a differential switch. A threshold voltage control circuithas an output terminal Vbout controlling the substrate voltage to be outputted to the substrate terminal of each of the two transistors Trand Trincluded in the differential switchfor controlling the threshold voltage of the two transistors of the differential switch. Accordingly, the present invention improves the decrease in the dynamic range of the current switch basic circuitdependent on the threshold of each of the two transistors in the differential switchand realizes a wider output voltage range without causing deterioration in properties even in a case that the power voltage is reduced in the current switch basic circuit