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:
Jun. 13, 1995
Filed:
Jan. 24, 1994
Howard R Samuels, Newton, MA (US);
Scott H Wayne, Sharon, MA (US);
Analog Devices, Inc., Wilmington, MA (US);
Abstract
A precision switched capacitor ratio system includes a capacitor; a switching device for selectively interconnecting the capacitor with one of a plurality of charging circuits and alternately connecting it with a discharge circuit for discharging the capacitor between each interconnection with a charging current; an integrating device interconnected with the capacitor for averaging the current during the charging and discharging of the capacitor for defining the switched capacitor equivalent resistance; and a clock device for providing synchronized clock signals for operating the switching device to precisely define the ratio of the frequencies of the interconnection of the capacitor with each of the charging circuits.