Circuit and method for dynamically adjusting a filter bandwidth

Abstract

A tracking circuit () is provided for controlling a locally-generated clock. A receive channel () in the tracking circuit receives an incoming signal and a local clock, generates a local signal based on the local clock, and compares the local signal and the incoming signal to generate a data signal and an unfiltered phase error signal. A loop filter () filters the unfiltered phase error signal to provide a filtered phase error signal. A numerically controlled oscillator () generates a correction clock based on the filtered phase error signal. And a filter control circuit () provides one or more filter control signals to control operational parameters of the loop filter. The correction clock is provided to the receive channel to modify at least one of the phase and frequency of the local clock. In addition, a sample switch () may also be provided to sample the unfiltered phase error signal.