Four phase charge pump operable without phase overlap with...

Details Four phase charge pump operable without phase overlap with... Four phase charge pump operable without phase overlap with...

2006-04-18

2006-04-18

Cunningham, Terry D. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S537000

Reexamination Certificate

active

07030683

ABSTRACT:
In a Dickson type charge pump in which a plurality of serially connected diodes sequentially respond to anti-phase 50/50 clock cross over or overlapped (φ1, φ2), efficiency of the charge pump is increased by providing with each diode a charge transfer transistor in parallel therewith between two adjacent nodes, and driving the charge transfer transistor to conduction during a time when the parallel diode is conducting thereby transferring any residual trapped charge at one node through the charge transfer transistor to the next node. Operating frequency can be increased by providing a pre-charge diode coupling an input node to the gate of the charge transfer transistor to facilitate conductance of the charge transfer transistor, and by coupling the control terminal of the charge transfer transistor to an input node in response to charge on an output node to thereby equalize charge on the control terminal and on the input node during a recovery period.

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“Charge Pumps: An Overview”, Louie Pylarinos, Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto, http://www.eecg.toronto.edu/˜kphang/ece1371/chargepumps.pdf, Downloaded Aug. 27, 2004, 7 pages.

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