Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Ryu Ogiwara0
Daisaburo Takashima0
Date of Patent
September 1, 2009
Patent Application Number
11684214
Date Filed
March 9, 2007
Patent Primary Examiner
Patent abstract
A supply voltage sensing circuit comprises an internal power supply circuit, which provides a constant output voltage regardless of the supply voltage. A delay circuit generates a delayed signal by delaying a variation in the output voltage. A divider circuit generates a divided voltage by dividing the supply voltage at a certain division ratio. A p-type MOS transistor has a source given the delayed signal and a gate given the divided voltage and turns on when the supply voltage lowers below a certain value. An output circuit provides an output voltage based on a drain voltage on the p-type MOS transistor.
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