| 摘要 |
A phase locked loop, comprising: a phase detector (115) configured to determine a phase difference (” Õ ) between a reference signal ( Õ ref ) and a feedback signal ( Õ fb ); a loop filter (120) configured to perform a filtering operation on a signal derived from the phase difference (” Õ ), and to provide a control signal; a frequency controlled oscillator (130) configured to receive the control signal and provide an output signal with a frequency that varies according to the control signal; wherein a low-pass filter (250) is provided between the phase detector (115) and the loop filter (120) and/or between the loop filter (120) and the frequency controlled oscillator (130), to reduce quantization noise from the phase detector. |
