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