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:
Oct. 19, 1999
Filed:
May. 19, 1997
Koji Naganawa, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
For providing a voltage booster circuit wherein the output voltage is boosted up with a sufficient ability, and smoothly and easily controlled as well to maintain a desired voltage level with little fluctuation, the voltage booster circuit of the invention comprises a plurarity of pumping circuits (1--1 to 1-n), each thereof connected in parallel between a power supply (Vcc) and an output terminal (VPUMP) for supplying a higher voltage than the power supply, driven by a pair of complementary pumping clocks; means for generating pump activating signals determining a number to be activated of said plurality of pumping circuits according to potential of the output terminal; and switching means (6-1 to 6-n) for supplying the pair of complementary pumping clocks to each of the number to be activated of the plurality of pumping circuits controlled with said pump activating signals.