at least one impedance control circuit, each of which is connected to {HEAD ~ an output end} of each carrier amplifier for controlling {TAIL ~ a load line impedance} of said each carrier amplifier 
at least one impedance control circuit , each of which is connected to { HEAD ~ an output end } of each carrier amplifier for controlling { TAIL ~ a load line impedance } of said each carrier amplifier
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH