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