an error path in signal communication with the main path configured to receive the input signal and control at least one of {HEAD ~ a gain} and a phase of a second order intermodulation component from the path turning signal to generate {TAIL ~ an intermodulation compensation signal}; and 
to generate
an error path in signal communication with the main path configured to receive the input signal and control at least one of { HEAD ~ a gain } and a phase of a second order intermodulation component from the path turning signal to generate { TAIL ~ an intermodulation compensation signal } ; and
OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH