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:
Aug. 17, 1993
Filed:
Mar. 02, 1992
Robert J Brewer, Lambourn, GB;
Analog Devices, Inc., Norwood, MA (US);
Abstract
A charge pump circuit for providing a bipolar voltage output at substantially double the unipolar voltage input source includes first and second voltage input terminals; a first and a second capacitor; a first switching device for selectively connecting first and second capacitors across the input terminals to charge each to the voltage of the input source; first and second voltage output terminals; a second switching device for selectively connecting the capacitors in series between one of the input terminals and one of the output terminals to generate a first polarity voltage which is substantially double the voltage of the input source; a third switching device for selectively connecting at least one of the capacitors in series between the other of the input terminals and the other of the output terminals to generate a second polarity voltage which is substantially double the voltage of the input source; and a clock for sequentially, selectively actuating the first, second and third switching devices.