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:
Dec. 23, 1997
Filed:
Aug. 30, 1995
Mitsuhiro Higashiho, Kasugai, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A charge-pump type booster circuit has a first capacitor, a power source applying unit, a transfer gate, a second capacitor, a switching unit, and a precharge circuit. The first capacitor is used to boost an output voltage, the power source applying unit is used to apply a first power supply voltage to an output terminal of the first capacitor. The transfer gate is used to transfer the boosted output voltage, and the second capacitor is used to boost a gate voltage of the transfer gate. The switching unit is used to control an input voltage of the second capacitor, and the precharge circuit is used to apply a specific high voltage to a control terminal of the transfer gate. Therefore, a sufficient high-voltage output (super-high power supply voltage) can be surely generated by using a low voltage (general high power supply voltage).