Patent ID: 6597754
Filing Date: 2003-07-22
Classification: H03L,H04B,H04L

Abstract:
A carrier-recovery loop that generates a reference signal with a reference frequency substantially equal to a received frequency of a received signal, the carrier-recovery loop comprising:a signal input that receives the received signal; a digitally controlled oscillator (DCO) that generates the reference signal at the reference frequency; a phase detector coupled to said signal input and to said DCO, wherein said phase detector receives the received signal from said signal input, wherein said phase detector receives the reference signal from said DCO, and wherein the phase detector generates a digital phase error signal, wherein the digital phase error signal indicates a phase difference between the received signal and the reference signal; a loop filter coupled to said phase detector and to said DCO, wherein said loop filter receives the digital phase error signal from said phase detector, and generates a digital feedback signal therefrom; wherein said DCO receives the digital feedback signal and adjusts the reference frequency in response to the digital feedback signal; and a memory coupled to said DCO, wherein said memory is operable to store an initializing value for the DCO generated during a data frame and to provide the initializing value to said DCO at the beginning of a subsequent data frame.