ABSTRACT: Recent advances in RF power amplifier (PA) design show that controlling only the fundamental and second harmonic impedances can limit achievable efficiency. Experimental GaN device data demonstrate that independent source and load tuning up to the third harmonic can yield measurable efficiency improvements, including under power back‑off conditions. This application note explains the value of third harmonic Load Pull and shows how the Maury Microwave MT2000 system enables this advanced characterization in practical customer laboratory environments.
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