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:
Apr. 02, 1991
Filed:
Mar. 21, 1990
Akihiro Murayama, Yokohama, JP;
Takeshi Koyama, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A sample and hold circuit for sampling an input signal having a variable input voltage. The circuit includes an input circuit for supplying the input signal, a holding capacitor for storing a charge voltage in response to a charge current supplied thereto when a charge voltage stored previously therein is lower than the input voltage and for producing a discharge current when the previous stored charge voltage is higher than the input voltage, a differential circuit for comparing the voltage levels of the input voltage and the charge voltage, and generating a differential current in response thereto, a current amplifier for generating the charge current in response to the differential current when the previous stored charge voltage is lower than the input voltage and for amplifying the discharge current when the previous stored charge voltage is higher than the input voltage and a switch for selectively activating and deactivating the current amplifier.