It should be understood that positive and negative are relative terms in reference to bias voltage applied to {HEAD ~ a source} of {TAIL ~ an N channel} or P channel device 
It should be understood that positive and negative are relative terms in reference to bias voltage applied to { HEAD ~ a source } of { TAIL ~ an N channel } or P channel device
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH