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:
May. 05, 1992
Filed:
Aug. 29, 1990
Applicant:
Inventor:
Durbin L Seidel, Fort Collins, CO (US);
Assignee:
NCR Corporation, Dayton, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C11C / ; H03K / ; H03K / ;
U.S. Cl.
CPC ...
307353 ; 307491 ; 307572 ; 307585 ;
Abstract
An improved sample-and-hold circuit includes a first MOSFET transmission gate connected between an analog input voltage and a storage capacitor. The first transmission gate is constructed to have low on resistance and operates for a predetermined period of time to rapidly charge the capacitor to input voltage. A second, smaller MOSFET transmission gate having reduced charge injection characteristics is connected in parallel with the first gate. The second gate is turned on coincidentally with the first gate but remains on for a short period of time after the first gate has been switched off.