{HEAD ~ Bandgap voltage reference} using bipolar parasitic transistors and {TAIL ~ MOSFETs} in the current source 
using
{ HEAD ~ Bandgap voltage reference } using bipolar parasitic transistors and { TAIL ~ MOSFETs } in the current source
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH