Capacitive charge pump

Details Capacitive charge pump Capacitive charge pump

2005-01-18

2005-01-18

Ton, My-Trang Nu (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

Reexamination Certificate

active

06844762

ABSTRACT:
A capacitive charge pump that can be implemented in such devices as e.g. a phase locked loop (PLL). The charge pump includes at least one capacitor in the charge path and discharge path for limiting the amount of charge provided to or removed from a filter capacitor of a PLL. In one example, a second capacitor may be provided in the charge path or discharge path to reduce the capacitance (if provided in series) or increase the capacitance (if provided in parallel) to adjust the maximum amount of charge transferred to a filter capacitor. In one example, multiple capacitive stages may be implemented in parallel to increase the maximum amount of charge transferred to a filter capacitor. Each stage is enabled after a delayed period of time from when the previous stage was enabled.

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