Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2007-12-11
2007-12-11
Lam, Tuan T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S534000, C327S536000, C327S537000, C327S538000, C327S539000, C323S313000, C363S059000
Reexamination Certificate
active
10923848
ABSTRACT:
To provide a step-down voltage output circuit which causes no latch-up phenomenon for the period between activation of a power supply and complete start of operation of a charge pump circuit. The step-down voltage output circuit of the present invention has the charge pump circuit with a first oscillator; a timer circuit in which a timer period is set according to an oscillating frequency of the above-mentioned first oscillator; and an N-channel MOS transistor in which one N-type diffusion layer is connected to an output terminal of the above-mentioned charge pump circuit, the other N-type diffusion layer is connected to ground potential, and a gate electrode is connected to an output terminal of the above-mentioned timer circuit to become conductive for the above-mentioned timer period.
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Fujii Keiichi
Kobayashi Taku
Lam Tuan T.
McDermott Will & Emery LLP
Nguyen Hiep
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