A phase locked loop (PLL) circuit includes a phase comparator that compares the phases of an input signal and a feedback signal and generates UP and DOWN pulses that are related to the phase difference. A charge pump receives the UP and DOWN pulses from the phase comparator and either charges or discharges...http://www.google.fr/patents/US5955928?utm_source=gb-gplus-shareBrevet US5955928 - Automatically adjusting the dynamic range of the VCO in a PLL at start-up for optimal operating point
Automatically adjusting the dynamic range of the VCO in a PLL at start-up ...
