Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-10-11
2009-12-08
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C363S059000, C363S060000
Reexamination Certificate
active
07629831
ABSTRACT:
Booster circuitry is provided that contains capacitor protection circuitry. The booster circuitry receives a digital input signal on an input line and provides a corresponding boosted digital output signal on an output line. The digital input signal may be received from an oscillator. The digital output signal may be a clock that is applied to a charge pump on a programmable logic device integrated circuit. The booster circuitry contains a metal-oxide-semiconductor capacitor. The capacitor protection circuitry ensures that the voltage across the capacitor in the booster circuit remains above a desired minimum voltage and below a desired maximum voltage during operation. The capacitor protection circuitry includes a control circuit that monitors the capacitor voltage when the booster circuit is operated while the oscillator is off and transistor-based circuitry that discharges one of the capacitor's terminals to a predetermined level when the booster circuit is operated while the oscillator is on.
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Chow Jeffery
Perisetty Srinivas
Altera Corporation
Kellogg David C.
Treyz G. Victor
Treyz Law Group
Wells Kenneth B.
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