An amplifying circuit amplifies and outputs voltage difference between first external input voltage and {HEAD ~ voltage} corresponding to {TAIL ~ second external input voltage} 
An amplifying circuit amplifies and outputs voltage difference between first external input voltage and { HEAD ~ voltage } corresponding to { TAIL ~ second external input voltage }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL