An apparatus for adjusting a phase difference between a positive signal of a differential signal and {HEAD ~ a negative signal} of {TAIL ~ the differential signal}, the apparatus comprising: 
An apparatus for adjusting a phase difference between a positive signal of a differential signal and { HEAD ~ a negative signal } of { TAIL ~ the differential signal } , the apparatus comprising :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH