The circuit 3, wherein {TAIL ~ the first transconductor} and {HEAD ~ the second transconductor} are N Channel Metal Oxide Semiconductor transistors 
The circuit 3 , wherein { TAIL ~ the first transconductor } and { HEAD ~ the second transconductor } are N Channel Metal Oxide Semiconductor transistors
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH