Fractional-N frequency synthesizer with jitter compensation

Details Fractional-N frequency synthesizer with jitter compensation Fractional-N frequency synthesizer with jitter compensation

1997-12-22

2000-10-31

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375374, 327157, H03D 324

Patent

active

061413941

ABSTRACT:
A fractional-N frequency synthesizer has a VCO with an output for supplying an output signal of a particular frequency, and an input for receipt of a control signal for controlling the operation of the VCO so that it locks in on a reference frequency. Compensation circuitry is coupled to the input for compensating the output signal for phase jitter. The compensation circuitry has a charge pump that supplies a compensation current to the input. The timing is derived from the output signal, thus rendering the compensation current independent of the frequency range of the VCO and of the reference frequency.

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"Fractional-N PLL Provides Fast, Low-Noise Synthesis", Wing S. Djen and Daniel Linebarger, Mi May 1994.
SA8025A, in Philips Semiconductors Data Handbook IC-17, 1996.

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