the first power supply supplies a first power supply voltage obtained by adding {TAIL ~ a voltage} corresponding to {HEAD ~ a forward voltage drop} of the first and third diodes to the first predetermined voltage, and 
the first power supply supplies a first power supply voltage obtained by adding { TAIL ~ a voltage } corresponding to { HEAD ~ a forward voltage drop } of the first and third diodes to the first predetermined voltage , and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH