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