at least one peaking amplifier arranged in parallel with the carrier amplifier in such a manner that the carrier amplifier and {HEAD ~ the peaking amplifier} collectively operate as {TAIL ~ a Doherty amplifier} 
collectively operate as
at least one peaking amplifier arranged in parallel with the carrier amplifier in such a manner that the carrier amplifier and { HEAD ~ the peaking amplifier } collectively operate as { TAIL ~ a Doherty amplifier }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL