disclosed herein is a circuit including a phase frequency detector configured to compare phases of an input signal and a feedback signal , and to generate first and second control signals as a function of that comparison . an attenuation circuit includes a capacitor coupled in series between a node and a switching node , and is configured to charge the capacitor and disconnect the switching node from ground based on assertion of the first control signal , and discharge the capacitor and connect the switching node to ground based on assertion of the second control signal .