Active RC notch filter for phase-locked loop

In this paper, we present some results of computer simulations oriented on frequency and noise properties of an active RC notch filter (ARCN filter), which is intended to provide high reference spur suppression in the phase detector output voltage of PLL. In this paper also has been presented the substitution of complicated active ARC structure with the simple passive RLC filter. On the base numerical simulations results it is possible to design good ARCN filters with small phase shift within active PLL bandwidth.