Method and apparatus for compensating for tuning...

Details Method and apparatus for compensating for tuning... Method and apparatus for compensating for tuning...

2007-10-19

2010-06-01

Pascal, Robert (Department: 2817)

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

C332S124000, C331S016000, C331S023000

Reexamination Certificate

active

07728690

ABSTRACT:
Techniques to compensate for nonlinearity of a tuning function of an oscillator are described. The tuning nonlinearity of the oscillator may be modeled as a disturbance input to the oscillator and may be compensated with an equal but opposite disturbance. In one design, a nonlinearity correction signal to compensate for the tuning nonlinearity may be generated, e.g., based on a phase error signal in a phase-locked loop (PLL) and a scaling factor determined adaptively. The nonlinearity correction signal may compensate for the n-th (e.g., second) order tuning nonlinearity, and an n-th order (e.g., squared) modulating signal may be used to derive the scaling factor and the nonlinearity correction signal. A control signal for the oscillator may be generated based on the nonlinearity correction signal and possibly one or more other signals. The control signal may be applied to the oscillator to adjust the oscillation frequency of the oscillator.

REFERENCES:
patent: 4564815 (1986-01-01), Naito
patent: 6909331 (2005-06-01), Ballantyne
patent: 6980581 (2005-12-01), Sha et al.
patent: 7015738 (2006-03-01), Cao
patent: 2007/0036238 (2007-02-01), Matero et al.
patent: 2007/0149148 (2007-06-01), Yoshikawa et al.
patent: 2008/0191811 (2008-08-01), Liang

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