DIGITAL COMMUNICATION DEVICE

摘要

A digital receiver has a local oscillator that provides a local oscillator signal, a frequency offset detector that provides a frequency offset signal that is representative of a difference between the local oscillator signal and a desired tuning frequency of the digital receiver, and a frequency controller that controls the frequency of the local oscillator on the basis of a stored control value. The frequency controller separately derives a short term drift compensation signal and a long term drift compensation signal from the frequency offset signal, at a first interval updates the stored control value on the basis of the derived short term drift compensation signal, and at a second interval updates the stored control value on the basis of the long term drift compensation signal. The first interval is substantially shorter than the second interval.