Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2006-11-09
2009-10-27
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S142000
Reexamination Certificate
active
07609099
ABSTRACT:
A circuit for detecting a power-on voltage of power supply encompasses a voltage divider connected between a first power supply and a second power supply, the potential of the second power supply is lower than the potential of the first power supply, and a detecting circuit connected between the first power supply and the second power supply. The voltage divider includes a series circuit encompassing a diode, a first dividing resistor connected to the diode and a second dividing resistor connected between the first dividing resistor and the second power supply. The detecting circuit includes a pMOS transistor whose gate electrode is connected to a connection node between the first dividing resistor and the second dividing resistor, a source resistor connected between the first power supply and the source electrode of the pMOS transistor and a drain resistor connected to the drain electrode of the pMOS transistor and the second power supply.
REFERENCES:
patent: 4100437 (1978-07-01), Hoff, Jr.
patent: 5778238 (1998-07-01), Hofhine
patent: 6320428 (2001-11-01), Atsumi et al.
patent: 7102395 (2006-09-01), Saito
patent: 2001-127609 (2001-05-01), None
patent: 2003-108241 (2003-04-01), None
patent: 2004-71864 (2004-03-01), None
Ogiwara Ryu
Takashima Daisaburo
Kabushiki Kaisha Toshiba
Le Dinh T.
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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