IM3 Suppression Using a Technology Independent Method Based on Vectorial Large-Signal Measurements

The linearisation of power amplifiers is an important issue, as the analog and especially digital baseband signals to be communicated become gradually more complex. We show that the predistortion signal, needed to cancel the third-order intermodulation product IM3, can accurately and straightforwardly be determined from two-tone vectorial large-signal measurements. We demonstrate that this quasi-automatic procedure is independent of component technology and operation class. Furthermore, we indicate that a black-box model, that represents the measured intermodulation product's dependencies, can be identified.