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:
Nov. 08, 2005
Filed:
May. 20, 2004
Kouji Mochizuki, Tokyo, JP;
Kouji Mochizuki, Tokyo, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A high-precision and high-performance level shift circuit, which is not adversely influenced by an offset error owned by an operational amplifier. Two sets of resistors () and () having the same resistance values, which are connected between differential output terminals and an operational amplifier () for performing a level shift control are provided. A feedback operation is carried out in such a manner that an average voltage of each of differential outputs () and () is continuously made coincident with a DC reference potential () irrespective of an offset error of an output-purpose operational amplifier, and a level shift function having a small error is realized. Two resistors (and) are series-connected between a differential output of a digital/analog converter () and a level shift circuit to output a voltage outside an output dynamic range of the digital/analog converter ().