a main path configured to amplify {HEAD ~ a power level} of an input signal and generate {TAIL ~ a path} turning signal; and 
a main path configured to amplify { HEAD ~ a power level } of an input signal and generate { TAIL ~ a path } turning signal ; and
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 OTH OTH OTH OTH