PLL circuit having loop filter and method of driving the same

Details PLL circuit having loop filter and method of driving the same PLL circuit having loop filter and method of driving the same

2007-07-02

2010-06-22

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S162000

Reexamination Certificate

active

07741888

ABSTRACT:
A PLL circuit includes a phase detector that compares the phase of an input clock and the phase of a feedback clock and generates a pull-up control signal and a pull-down control signal. A loop filter pumps a voltage in response to the pull-up and pull-down control signals, filters the pumped voltage, and outputs a control voltage. A voltage controlled oscillator receives the control signal and oscillates an output clock. A clock divider divides the frequency of the output clock at a predetermined rate to generate the feedback clock. In the PLL circuit, the loop filter includes a compensator that compensates for a variation.

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