Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2008-08-05
2010-12-07
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S538000, C327S540000, C323S313000
Reexamination Certificate
active
07847624
ABSTRACT:
A disclosed invention is an internal power supply circuit, which generates an internal power supply from a first power supply. The circuit comprises a first internal step-down power supply generation unit, which generates a first internal step-down power supply from the first power supply; a normal second internal step-down power supply generation unit, which generates a second internal step-down power supply from the first internal step-down power supply in the normal operating state, and which, at the time of power supply startup, begins operation to generate the second internal step-down power supply at a first timing at which a voltage of the first internal step-down power supply reaches a prescribed reference level; and, a startup power supply load unit, which begins to consume, before the first time, current from the first internal step-down power supply.
REFERENCES:
patent: 5821808 (1998-10-01), Fujima
patent: 5841703 (1998-11-01), Wojciechowski
patent: 6229385 (2001-05-01), Bell et al.
patent: 6483756 (2002-11-01), Takeuchi et al.
patent: 9-62380 (1997-03-01), None
patent: 2001-028188 (2001-01-01), None
patent: 2002-152025 (2002-05-01), None
Cole Brandon S
Donovan Lincoln
Fujitsu Patent Center
Fujitsu Semiconductor Limited
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