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