Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2008-06-19
2011-10-18
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
C327S534000, C327S059000
Reexamination Certificate
active
08040174
ABSTRACT:
A charge pump with a MOS-type capacitor, where the MOS-type capacitor is operated in an inversion region in which capacitance varies as a function of the frequency of the applied signal. The charge pump is switched to transfer charge from an input node to the capacitor and from the capacitor to an output node. During a transition interval, a relatively high frequency switching signal is used to lower the capacitance and increase efficiency. During a settling interval, a relatively low frequency switching signal is used, in which case the capacitance is higher, but similar to a level which would be seen if the capacitor was operated in an accumulation region. MOS capacitor dimensions and switching intervals are mutually optimized to provide high efficiency and required throughput. The charge pump may be configured as a voltage multiplier, divider, inverter or follower, for instance.
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Donovan Lincoln
Goyal Shikha
SanDisk IL Ltd.
Vierra Magen Marcus & DeNiro LLP
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