Patent ID: 7791408

Claim:
A circuit for demodulating a modulated signal, comprising: a demodulator configured to receive a modulated signal, to receive a receiver clock signal, and to provide a received data signal that is based, at least in part, on the modulated signal and on the receiver clock signal; a frequency offset estimator configured to estimate an offset between a frequency of the modulated signal and a frequency of the receiver clock signal, and to provide an error signal that is based, at least in part, on the estimated offset; a frequency controller configured to receive the error signal and to provide a frequency control signal such that a value of the frequency control signal is maintained while a value of the error signal is outside an adjustment range, and is further configured to adjust the adjustment range based, at least in part, on the error signal; and an oscillator configured to receive the frequency control signal and to provide the receiver clock signal such that the frequency of the receiver clock signal is based, at least in part, on the frequency control signal.