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:
Feb. 20, 1996
Filed:
Nov. 07, 1994
Bruce H Kamens, Thomaston, CT (US);
Timex Corporation, Middlebury, CT (US);
Abstract
A capacitive charge pump circuit and associated method is provided for outputting an output voltage which has a magnitude which is an integer multiple of the magnitude of a power supply voltage used to power the circuit. In one form, a capacitor is charged to the power supply voltage, V.sub.s. The capacitor is alternately coupled to the power supply voltage and ground so that in an alternating manner, 2 V.sub.s and -V.sub.s appear across it. By coupling a first electrode of a piezoelectric crystal to the capacitor and a second electrode of the piezoelectric crystal to the power supply voltage, a signal having a peak-to-peak magnitude which is three times that of the power supply voltage will drive the piezoelectric crystal.