The circuit 22, wherein {TAIL ~ each} of the first, second, and third switch means includes {HEAD ~ a field effect transistor} 
The circuit 22 , wherein { TAIL ~ each } of the first , second , and third switch means includes { HEAD ~ a field effect transistor }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD