Fractional-N offset phase locked loop

Details Fractional-N offset phase locked loop Fractional-N offset phase locked loop

2006-08-29

2006-08-29

Mis, David (Department: 2817)

Modulators

Phase shift keying modulator or quadrature amplitude modulator

C375S308000

Reexamination Certificate

active

07098754

ABSTRACT:
A fractional-N offset phase locked loop (FN-OPLL) is provided. The FN-OPLL includes a fractional divider, a phase detector, a loop filter, a voltage controlled oscillator (VCO), and feedback circuitry. Combiner circuitry combines an initial fractional divide value and a modulation signal to provide a combined fractional divide value. Based on the combined fractional divide value, the fractional-N divider divides a reference frequency and provides a divided reference frequency to the phase detector. The phase detector compares a phase of the divided reference frequency to a phase of a feedback signal to provide a comparison signal. The comparison signal is filtered by the loop filter to provide a control signal to the VCO, where the control signal controls a frequency of an output signal of the VCO. The output signal is processed by the feedback circuitry to provide the feedback signal to the phase detector.

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