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:
Apr. 26, 2005
Filed:
May. 14, 2004
Masayuki Otsuka, Tokyo, JP;
Teruhiro Harada, Kanagawa, JP;
Masayuki Otsuka, Tokyo, JP;
Teruhiro Harada, Kanagawa, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
An internal step-down power supply circuit has an internal step-down power-supply output node, a driver, a divider circuit and a current mirror circuit. The internal node provides an internal step-down power supply potential. The driver adjusts an external power-supply potential and provides an adjusted external power-supply potential to the internal node. The divider circuit divides a voltage that appears on the internal node and provides a divided voltage. The current mirror circuit is connected to the divider circuit. The current mirror circuit compares the voltage provided by the divider circuit and a reference voltage. The current mirror circuit sets the conductance of a first transistor feeding a current in response to the reference voltage to n times of the conductance of a second transistor feeding a current in response to the voltage provided from the divider circuit, wherein n is greater than 1.