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