A source electrode s of {TAIL ~ the transistor} 12 is connected to a grounded terminal 19 having a ground potential equal to {HEAD ~ OV} 
A source electrode s of { TAIL ~ the transistor } 12 is connected to a grounded terminal 19 having a ground potential equal to { HEAD ~ OV }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD