Frequency drift compensation for a frequency synthesizer

摘要

Methods and devices for the compensation for variations in the frequency drift of a free-running VCO/DCO (voltage/digital controlled oscillator), e.g. inside a frequency synthesizer, are described. In one aspect, the frequency drift of the high-frequency synthesizer is compensated by adjusting the frequency of the baseband signal. A counter unit is used to determine the frequency offset between the frequency of the free-running oscillator and a reference clock. A difference signal is used to correct the upstream or downstream signal.