Supply-terminal 40 MHz BW characterization of impedance-like nonlinear functions for envelope tracking PAs

We present an approach for the dynamic characterization of the non-idealities arising in envelope tracking (ET) systems when either the radio-frequency (RF) power amplifier (PA) or the supply modulator (SM) are driven into nonlinear operation. Impedance-like nonlinear functions, derived through a modified Volterra formulation, are here introduced and measured at the supply terminal over 40 MHz bandwidth (BW), allowing better predictions of the dynamic voltage and current at the SM-PA interface.

[1]  Dominique Schreurs,et al.  Active baseband drain-supply terminal load-pull of an X-band GaN MMIC PA , 2015, 2015 10th European Microwave Integrated Circuits Conference (EuMIC).

[2]  Rik Pintelon,et al.  System Identification: A Frequency Domain Approach , 2012 .

[3]  T. Reveyrand,et al.  A measurement set-up and methodology combining dynamic biasing and baseband predistorsion for high efficiency and linear amplifier design , 2010, 2010 IEEE MTT-S International Microwave Symposium.

[4]  Dominique Schreurs,et al.  A compact measurement set-up for envelope-tracking RF PAs with calibrated sensing of baseband V/I at the supply terminal , 2015, 2015 86th ARFTG Microwave Measurement Conference.

[5]  Fabio Filicori,et al.  A Three-Port Nonlinear Dynamic Behavioral Model for Supply-Modulated RF PAs , 2016, IEEE Transactions on Microwave Theory and Techniques.

[6]  Zoya Popovic,et al.  Multi-Frequency Measurements for Supply Modulated Transmitters , 2015, IEEE Transactions on Microwave Theory and Techniques.