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