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