A third order analogue pre-distorter MMIC for E-band PA linearisation

In this paper we present the design, characterisation and non-linear control of an analogue pre-distortion (APD) MMIC at E-band. With non-linear behaviour models of the APD MMIC, we demonstrate the capability of controlling the quadrature gain and quadrature third order term. Finally, the APD is combined with a 1 W E-band PA, where we by cascading their measured responses show overall more linear behaviour towards saturated output power compared with the non-linearised 1 W PA. Simulated with 256 QAM modulated signals, the average output power of the linearised PA was 22.2 dBm in comparison to 18.7 dBm.