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