Phase-locked loop circuit

Details Phase-locked loop circuit Phase-locked loop circuit

2008-01-09

2010-02-16

Nguyen, Hai L (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S148000

Reexamination Certificate

active

07663417

ABSTRACT:
A phase-locked loop circuit comprises a phase frequency detector, a charge pump associated with a loop capacitance, and a voltage controlled oscillator. The phase frequency detector receives a reference clock signal on a first input and a feedback signal from the voltage controlled oscillator on a second input. The charge pump receives control inputs from outputs of the phase frequency detector. Pulse duration detecting circuitry limits charge and discharge current pulses supplied to the loop capacitance by the charge pump to durations less than predetermined permissible durations.

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patent: 101 54 993 (2005-03-01), None
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