A first analogue signal and {HEAD ~ a second analogue signal} to be multiplied are supplied to a first comparator group 10a and {TAIL ~ a second comparator group} 10b, respectively 
are supplied to
A first analogue signal and { HEAD ~ a second analogue signal } to be multiplied are supplied to a first comparator group 10a and { TAIL ~ a second comparator group } 10b , respectively
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH