Abstract: Communication apparatus (100) corrects for amplitude imbalance caused by differences in circuitry that process in-phase and quadrature signals. The in-phase and quadrature signals are alternately routed in rapid succession through first and second parallel processing circuits or signal paths (140, 150) to cancel imbalances between the signal paths. Switches (132, 134) are employed at inputs to and outputs from corresponding portions of both signal paths, and these switches (132, 134) are synchronously operated in response to a control signal to interchange signals on the signal paths.