Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2007-06-05
2009-11-03
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
C327S306000, C363S062000, C307S109000
Reexamination Certificate
active
07612603
ABSTRACT:
A frequency control circuit including a controlled oscillator and an amplifier circuit is disclosed for providing a clock signal to a switched capacitor circuit which divides an input voltage to provide an output voltage. The controlled oscillator has a frequency control input receiving a frequency control signal and an output for providing the clock signal at a frequency based on the frequency control signal. The amplifier circuit has an input for receiving the output voltage and an output providing the frequency control signal based on droop of the output voltage. In one embodiment, the amplifier circuit adjusts the frequency control signal to optimize efficiency of the switched capacitor circuit over a voltage range of the output voltage, which changes based on load level.
REFERENCES:
patent: 5457421 (1995-10-01), Tanabe
patent: 7099167 (2006-08-01), Fujise
patent: 2004/0136213 (2004-07-01), Fujise
patent: 2007/0296383 (2007-12-01), Xu et al.
patent: 2008/0157723 (2008-07-01), Xing et al.
patent: 2008/0239772 (2008-10-01), Oraw et al.
Petricek Shea Lynn
Xing Kun
Donovan Lincoln
Intersil America's Inc.
O'Neill Patrick
Stanford Gary R.
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