a first synthesizer in {HEAD ~ signal communication} with the main path and {TAIL ~ the error path} configured to generate an output signal responsive to the intermodulation compensation signal, 
a first synthesizer in { HEAD ~ signal communication } with the main path and { TAIL ~ the error path } configured to generate an output signal responsive to the intermodulation compensation signal ,
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH