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. 29, 2000
Filed:
Aug. 20, 1998
Masahiro Adachi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A charge pumping circuit includes a constant current source, a switch element, a first MOS transistor, a second MOS transistor, and a switching-off circuit. The constant current source generates and outputs a current having a constant current value. The switch element is turned on and outputs a current determined by the constant current source when an input signal is active. The first MOS transistor flows the current output from the switch element. The second MOS transistor constitutes a current mirror circuit together with the first MOS transistor, and outputs a current having a current value based on the current flowing through the first MOS transistor, as one of charge and discharge currents. The switching-off circuit turns off the second MOS transistor by charging or discharging the gate when the input signal is inactive.