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. 01, 2000
Filed:
Dec. 14, 1998
Andrew Bruce Forbes, Somerville, MA (US);
James Francis Imbornone, Tewksbury, MA (US);
Raymond Thomas Pavio, Lexington, MA (US);
The Whitaker Corporation, Wilmington, DE (US);
Abstract
This invention provides a voltage inverting charge pump 20. The charge pump 20 produces an output at node 60 which is twice the magnitude of the inverse of the input voltage applied to node 50. A first set of switches 22, 24, 26, 28 are connected to the pair of pump capacitors 36, 38 and a voltage supply input so as to connect the pump capacitors 36, 38 and the voltage supply input in parallel when the first set of switches 22, 24, 26, 28 is closed. A second set of switches 30, 32, 34 is connected to the pump capacitors 36, 38, a hold capacitor 40, and an output terminal 60 so as to connect the charged pump capacitors 36, 38 in series with the output terminal 60 and in parallel with the hold capacitor 40 when the second set of switches 30, 32, 34 is closed.