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:
Jun. 22, 2004
Filed:
Sep. 16, 2002
Masayuki Otsuka, Tokyo, JP;
Teruhiro Harada, Kanagawa, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
An internal step-down power supply circuit improves response performance (transition from a standby state to an active state in particular) of a system, without increasing current consumption. The internal step-down power supply circuit includes an output node for outputting an internal step-down power-supply potential; a driver for adjusting an external power-supply potential VDD and supplying it to the output node; a divider circuit for dividing a voltage developed at the output node and outputting the divided voltage; and a differential amplifier for comparing the divided voltage and a reference voltage. The differential amplifier outputs a voltage equivalent to twice a predetermined gain. The operational amplifier sets the conductance of first transistors for feeding a current responsive to the reference voltage to twice or more the conductance of second transistors for feeding a current responsive to the divided voltage.