{HEAD ~ The first bias circuit} has a first reference load element formed of a first material and generates {TAIL ~ a first bias voltage} 
{ HEAD ~ The first bias circuit } has a first reference load element formed of a first material and generates { TAIL ~ a first bias voltage }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL