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:
Aug. 20, 2002
Filed:
Nov. 06, 2001
Satoru Miyabe, Tokyo, JP;
Yasuhiro Sugimoto, Yokohama, JP;
Other;
Abstract
In a sample-and-hold circuit using a completely differential type operational amplifier circuit, to promote operational stability, to restrain a variation in a balance point of a middle value of differential output signals and to promote stability and accuracy of an A/D converter are achieved by a constitution as bellow. There is provided a common phase feedback circuit common phase feedback hold capacitors CF and CF of which are connected to input terminals IN and IN of a completely differential type operational amplifier circuit during a sample period, by way of reset switches RS and RS connecting the input terminals IN and IN and output terminals OUT and OUT of the completely differential type operational amplifier circuit the common phase feedback hold capacitors CF and CF are charged to thereby determine a balance point of a middle value of differential output signals from the output terminals OUT and OUT and during a hold period, the balance point of the middle value of the differential output signals is maintained by electric charge charged to the common phase feedback hold capacitors CF and CF regardless of the differential output signals.