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