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:
Jan. 20, 2009
Filed:
Nov. 15, 2005
Mako Okamoto, Hyogo, JP;
Fukashi Morishita, Tokyo, JP;
Mako Okamoto, Hyogo, JP;
Fukashi Morishita, Tokyo, JP;
Renesas Technology Corp., Chiyoda-Ku, Tokyo, JP;
Abstract
A detector circuit and a negative voltage generating circuit capable of performing high-speed operation are provided. A negative voltage generating circuit includes a charge pump circuit, a first voltage divider circuit that makes a voltage division between an output of the charge pump circuit and a power supply to output a detect potential, a reference voltage generating circuit that generates a reference potential, and a comparator circuit that compares the detect potential and the reference potential. The charge pump circuit is driven by an output signal of the comparator circuit and generates the negative voltage. In the first voltage divider circuit, NMOS transistors and make the voltage division between the negative voltage and the power supply to obtain the detect potential.