{HEAD ~ A phase detector circuit} comprising {TAIL ~ a control circuit}, a pump up circuit and a pump down circuit 
comprising
{ HEAD ~ A phase detector circuit } comprising { TAIL ~ a control circuit } , a pump up circuit and a pump down circuit
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH