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