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:
Aug. 09, 2005
Filed:
Nov. 24, 2003
Hiroshi Tanigawa, Tsurugashima, JP;
Satoru Yamane, Tsurugashima, JP;
Hiroshi Tanigawa, Tsurugashima, JP;
Satoru Yamane, Tsurugashima, JP;
Toko, Inc., Tokyo, JP;
Abstract
Disclosed is a constant voltage power supply, which comprises an error amplifier VEA including a transistor Mand a transistor Mhaving the same ratio between channel width and channel length as that of the transistor MThe gate and source of the transistor Mare connected to the gate of a transistor Mto form a current mirror circuit in conjunction with the transistor MFurther, the drain of the transistor Mis connected with a transistor Madapted to be switched in response to an external control signal Sg. For example, when the transistor Mis in ON state, any signal amplification function of the transistor Mis vanished away, and the gain of the error amplifier VEA is lowered. The circuit configuration for changing the gain of the error amplifier VEA makes it possible to strike a balance between high-speed response characteristic in an active mode and operational stability in a sleep mode, and reduce a circuit area required for being formed on an integrated circuit.