Polar modulation / one-point frequency modulation with...

Details Polar modulation / one-point frequency modulation with... Polar modulation / one-point frequency modulation with...

2011-08-09

2011-08-09

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C332S127000

Reexamination Certificate

active

07995697

ABSTRACT:
Apparatuses and methods for operating a modulation system using a flexible reference frequency signal are disclosed. A modulation system uses a phase-locked loop (PLL). An internal reference signal source is configured to provide an internal reference signal having an internal frequency that is substantially independent of the reference frequency. A frequency signal source is configured to provide a plurality of first samples of the frequency signal taken at a first sampling frequency according to the internal reference signal. A resampling device is configured to receive and resample the plurality of first samples to generate a plurality of second samples taken at a second sampling frequency according to the reference frequency. A loop gain compensation device is configured to receive the reference frequency and apply an offset gain to inversely offset a change in PLL loop gain responsive to a change in the reference frequency.

REFERENCES:
patent: 6049255 (2000-04-01), Hagberg et al.
patent: 6670861 (2003-12-01), Balboni
patent: 2005/0141638 (2005-06-01), Haiut
patent: 2005/0156676 (2005-07-01), Wang et al.

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