wherein the comparison apparatus comprises a comparator having a first input that receives the reference voltage and {HEAD ~ a second input} that receives a single ended signal of {TAIL ~ the differential signal}, and 
wherein the comparison apparatus comprises a comparator having a first input that receives the reference voltage and { HEAD ~ a second input } that receives a single ended signal of { TAIL ~ the differential signal } , and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH