Abstract
ABSTRACTThis article presents generalized design equations for achieving broadband second harmonic tuned power amplifiers (PAs) that are operated in class‐B, class‐AB, or class‐A bias conditions. The investigation is carried out by deriving the general intrinsic drain current and voltage waveforms for conduction angle, α, varying between 180 and 360°. New impedance solutions are then extracted using the generalized current and voltage equations. Shifted fundamental design space and expanded second harmonic impedance area are obtained when α is swept between 180 and 360°. A Gallium Nitride (GaN) fabricated PA is operated in class‐AB and delivers an output power greater than 40 dBm with minimum drain efficiency of 73% in the frequency band ranging from 500 to 950 MHz. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2787–2789, 2016
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