Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-08-08
2006-08-08
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
C363S059000
Reexamination Certificate
active
07088171
ABSTRACT:
An improved charge pump circuit that is capable of producing a constant output current. The charge pump circuit includes a controllable current source, at least one switching element coupled between the controllable current source and an output node, and a load capacitor coupled between the output node and ground potential. The switching element switches in response to an input signal to allow current pulses to flow from the controllable current source through the output node. The load capacitor operates as an integrator to convert the output current pulses into a voltage level. The controllable current source provides increased current levels as the output voltage level of the charge pump increases, thereby enhancing the overall efficiency of the charge pump circuit.
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Brady III W. James
Cunningham Terry D.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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