Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-10-03
2006-10-03
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
C327S544000, C365S227000, C363S060000
Reexamination Certificate
active
07116154
ABSTRACT:
A low power charge pump is disclosed. A pump driving node of a first pump stage is selectively coupled to a pump driving node of the subsequent pump stage. Subsequent to a transfer of charge from a first pump stage to a subsequent stage, the first and subsequent pump driving nodes are coupled. Residual charge on a first stage pump driving node is thereby transferred to a subsequent pump driving node. Subsequent to the transfer of charge from the first pump driving node to the second pump driving node, the nodes are uncoupled. By selectively coupling a first pump stage to a pump driving node of the subsequent pump stage, the first pump driving node may pre-charge the subsequent pump driving node, thereby reducing the energy that must be provided by clock driving circuitry to produce a positive-going transition of a driving clock. Advantageously, pre-charging energy is taken from the first stage, reducing the energy that was heretofore dissipated by clock driving circuitry during a negative-going clock signal transition. In this novel manner conversion efficiency of a charge pump device may be beneficially increased, providing enhanced low power performance.
REFERENCES:
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patent: 6008690 (1999-12-01), Takeshima et al.
patent: 6154088 (2000-11-01), Chevallier et al.
patent: 6781440 (2004-08-01), Huang
patent: 6788111 (2004-09-01), Sun et al.
patent: 2002/0014908 (2002-02-01), Lauterbach
patent: 2002/0101744 (2002-08-01), DeMone
Callahan Timothy P.
Englund Terry L.
Spansion LLC
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