Systems and methods for improved VCO gain tracking loop

Details Systems and methods for improved VCO gain tracking loop Systems and methods for improved VCO gain tracking loop

2011-04-12

2011-04-12

Chang, Joseph (Department: 2817)

Oscillators

With frequency calibration or testing

C331S016000

Reexamination Certificate

active

07924101

ABSTRACT:
Methods and apparatus for calibrating the VCO element of a phase-locked loop to correct for non-linearities are disclosed. The modulation port of the VCO may be characterized to generate a tuning model, which may then be used to generate a correction signal to be combined with an input signal and applied to the VCO modulation port. The tuning model may be based on a third or higher order polynomial generated from a plurality of open-loop frequency measurements of the VCO.

REFERENCES:
patent: 2005/0052251 (2005-03-01), Jensen et al.
patent: 2006/0145767 (2006-07-01), Vaananen

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