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