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:
Dec. 28, 2004
Filed:
Aug. 12, 2003
Christopher Andrew Devries, Ottawa, CA;
Ralph Dickson Mason, Ottawa, CA;
ENQ Semiconductor Inc., Ottawa, CA;
Abstract
The invention relates to electronic “sample and hold” circuits and, in particular, to such circuits which may implemented in integrated form. A method and circuit are provided for improving isolation during the hold mode of operation of a sampling circuit. An input differential signal is provided to parallel circuit paths (viz. a primary sampling path and an isolation path) which are identical (electronically equivalent) and, therefore, provide the same impedance leading to hold capacitor(s). The circuit paths are configured, relative to the differential inputs, so that any feed through (leakage) of the differential input signal is subtracted (cancelled) during the hold mode.