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. 02, 2001
Filed:
Nov. 09, 1998
Shunichi Sukegawa, Tsukuba, JP;
Shinji Bessho, Suita, JP;
Masayuki Hira, Tokorozawa, JP;
Yasushi Takahashi, Urawa, JP;
Tsutomu Takahashi, Tachikawa, JP;
Koji Arai, Kodaira, JP;
Other;
Abstract
Drop in the power supply level right after change can be suppressed greatly when changing the power to the internal power supply voltage from the external power supply voltage of an overdrive system. Voltage generating circuit VG,is connected to the V,line which raises the V,line to a voltage higher than V,beforehand prior to changing to internal power supply voltage V,from external power supply voltage V,, and restores the V,line voltage which drops after the change to V,. More specifically, there are detecting circuit part,which detects the V,line potential, first switching element M,connected between the V,line and the V,line and which operates according to the detected result of detecting circuit part,, and second switching element M,connected between common voltage V,and connection node ND,between first switching element M,and detecting circuit part,, which changes the potential of connection node ND,by conducting according to input preliminary voltage step up signal MVDL, and by it conducts first switching element M,for a fixed time.