Charge pump structure for reducing capacitance in loop...

Details Charge pump structure for reducing capacitance in loop... Charge pump structure for reducing capacitance in loop...

2007-09-18

2007-09-18

Nguyen, Linh My (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S157000

Reexamination Certificate

active

11561899

ABSTRACT:
A charge pump and loop filter circuit of a phase locked loop includes a resistor, first and second capacitors, first and second input current sources for supplying first and second currents to the circuit, a first output current source for outputting the first current from the circuit, and a second output current source for receiving the second current from the circuit. The charge pump also contains a plurality of up pulse switches and down pulse switches for controlling current flow through the circuit such that only a fraction of the current that flows through the resistor flows into and out of the first capacitor for charging and discharging the first capacitor. The size of the first capacitor can be reduced accordingly based on the amount of current used to charge and discharge the first capacitor.

REFERENCES:
patent: 5424689 (1995-06-01), Gillig et al.
patent: 6546059 (2003-04-01), Knoll et al.
patent: 6744292 (2004-06-01), Chen et al.
patent: 7120217 (2006-10-01), Schwarzmueller

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