Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2005-12-27
2005-12-27
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C363S059000
Reexamination Certificate
active
06980045
ABSTRACT:
A charge pump circuit for generating various pumped voltages includes a first charge pump including a plurality of first charge pump stages responsive to a first set of clock signals and having threshold voltage cancellation circuitry, a second charge pump including a plurality of second charge pump stages responsive to a second set of clock signals different from the first clock signals, and a switching circuit configured to selectively connect the second charge pump in series between the first charge pump and a voltage rail in response to a mode signal (MODE). For some embodiments, a plurality of the charge pump circuits can be selectively connected in parallel in response to corresponding select signals to generate various drive currents.
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Tanzawa, Toru et al.; “Circuit Techniques for a 1.8-V-Only NAND Flash Memory,” IEEE Journal of Solid-State Circuits, Jan. 2002, vol. 37, No. 1, IEEE, 3 Park Avenue, 17th Floor, New York, NY 10016-5997, pp. 84-89.
Callahan Timothy P.
Englund Terry L.
Paradice III William L.
Xilinx , Inc.
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