I. Introduction
Modern communication signals have a very large peak to average power ratio to increase their spectral efficiency. This requires the use of advanced power amplifier (PA) architectures to provide amplification with good energy efficiency. Most of these architectures make use of multiple transistors interacting non-linearly. The most popular of these solutions is the Doherty PA [1], which is almost a standard choice in narrowband base-station transmitters. The more recently introduced load modulated balanced amplifier (LMBA) [2], [3] and some of its variants, like the inverted-LMBA, have demonstrated a better ability to operate on wider frequency bands.