The second time difference may be a time difference between falling edges of the first component of the differential signal and {HEAD ~ the second component} of {TAIL ~ the phase shifted signal} 
The second time difference may be a time difference between falling edges of the first component of the differential signal and { HEAD ~ the second component } of { TAIL ~ the phase shifted signal }
OTH OTH OTH OTH OTH 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 TAIL