Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2007-10-09
2007-10-09
Tra, Quan (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
Reexamination Certificate
active
11420559
ABSTRACT:
A charge pump system has a charge pump for receiving a clock signal and provides an output signal of increased voltage magnitude in response to an enable signal. A plurality of comparators is coupled to the charge pump for detecting when the output signal is greater than a reference value. Each of the plurality of comparators is controlled by a respective different control signal derived from the clock signal and has differing phases. Detection circuitry is coupled to the plurality of comparators for providing the enable signal in response to detecting first leading rising edges and first leading falling edges of signals provided by the plurality of comparators. The interleaving operation of the comparators results in tighter regulation of the charge pump which reduces voltage ripple without significantly increasing capacitive load on the charge pump.
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patent: 2004/0208026 (2004-10-01), Kwon
Chiu Joanna G.
Freescale Semiconductor Inc.
King Robert L.
Tra Quan
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