{HEAD ~ a second synthesizer} configured to synthesize the second order intermodulation component of the first sub path and {TAIL ~ the input signal} of the second sub path so as to generate a synthesizing signal; and 
configured to synthesize
{ HEAD ~ a second synthesizer } configured to synthesize the second order intermodulation component of the first sub path and { TAIL ~ the input signal } of the second sub path so as to generate a synthesizing signal ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH