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. 26, 2000
Filed:
Feb. 25, 1998
Kabushiki Kaisha Toshiba, Kanaqawa-ken, JP;
Abstract
A driving voltage supplied to a semiconductor integrated circuit can be controlled. The semiconductor integrated circuit device provided with a voltage converter circuit comprises: a buffer circuit having: a P-channel MOS transistor having a source connected to a first supply voltage; and an N-channel MOS transistor having a source connected to a second supply voltage and a drain connected to a drain of the P-channel MOS transistor, an output voltage being outputted from a common-connected drain terminals of the two MOS transistors; a duty ratio control circuit having: a counter for outputting a first n-bit signal by repeatedly counting up numbers from 0 to (2.sup.n -1) one by one in synchronism with a first clock signal; and a comparator circuit for comparing the first n-bit signal with a second n-bit signal applied from the outside, and for outputting a first control signal to a gate of the P-channel MOS transistor and a second control signal to the N-channel MOS transistor; and a smoothing circuit for smoothing the output of the buffer circuit, a voltage smoothed by the smoothing circuit being outputted as an output of the voltage converter circuit.