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