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