{HEAD ~ A second pair} of analog signals representing the difference and sum of the pairs of analog signals is generated and presented to {TAIL ~ a signal processing circuit} in combination with the first pair of phase quadrature signals 
presented to
{ HEAD ~ A second pair } of analog signals representing the difference and sum of the pairs of analog signals is generated and presented to { TAIL ~ a signal processing circuit } in combination with the first pair of phase quadrature signals
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH