On the Double-Inflection Characteristic of the Continuous-Wave AM/AM in Class-F−1 Power Amplifiers

• Published in: IEEE microwave and wireless components letters Vol. 28; no. 12; pp. 1131 - 1133
• Main Authors: Sharma, Tushar, Roberts, Jeffery, Holmes, Damon G., Darraji, Ramzi, Jones, Jeffery K., Ghannouchi, Fadhel M.
• Format: Journal Article
• Language: English
• Published: IEEE 01.12.2018
• Subjects: Active load–pull; AM/AM inflection; amplitude-to-amplitude modulation (AM/AM); class-F; Gallium nitride; gallium nitride (GaN); Harmonic analysis; Impedance; linearity; power amplifier (PA); Power amplifiers

This letter investigates the impact of open second-harmonic impedance on the static amplitude-to-amplitude modulation (AM/AM) characteristic of class-F −1 power amplifiers (PAs). The phenomenon of double gain compression in harmonically tuned PAs is analyzed for the first time. The study starts with...