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. 14, 1999
Filed:
Apr. 06, 1998
Salomon Vulih, Neshamic Station, NJ (US);
Donald R Preslar, Somerville, NJ (US);
Thomas A Jochum, Durham, NC (US);
Intersil Corporation, Palm Bay, FL (US);
Abstract
An integrated S/H circuit includes a first field-effect transistor (FET) formed on a substrate with a sampling capacitor, and a buffer amplifier having an input connected to the sampling capacitor and an output connectable to the body of the first FET. The buffer amplifier thereby reduces undesired effects from a parasitic diode formed by the body and sampling capacitor. More particularly, the first FET preferably has a first conduction terminal for receiving the input signal, a second conduction terminal connected to the sampling capacitor, and a control terminal responsive to control signals for connecting the input signal to the sampling capacitor during a sampling time, and for disconnecting the input signal from the sampling capacitor during a holding time. The circuit may include one or more switches for connecting the body of the first FET to the output of the buffer amplifier during the holding time to thereby apply a holding voltage from the sampling capacitor to the body of the first FET. The holding voltage overcomes the voltage droop as would otherwise be caused by the parasitic diode. The switches may also connect the body of the first FET to a supply voltage during the sampling time. In addition, the buffer amplifier may have a substantially unity gain.