A frequency-domain method is formulated for the analysis of arbitrarily loaded Class-E circuits based on the harmonic balance technique. General loading requirements for optimum Class-E mode of operation are derived. Essential design information such as effects of turn-on resistance, harmonic terminations and idealised load-pull contours are given. The theoretical findings are then transformed into a straightforward design procedure. A 1.8 GHz experimental amplifier was constructed, which shows a state-of-the-art drain efficiency of over 90% from 0.5 to 4 V supply voltage.
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Choi et al. (2001) studied this question.
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