Analysis of a class E power amplifier with series-parallel resonator

The authors propose new class E power amplifier configuration with an equivalent series-parallel resonator network. The boundary conditions for the 100% efficiency operations are analysed under the conditions that the duty ratio is 0.5 and the loaded quality factor is infinite. If the DC supply voltage and the output power are assumed the same, the load resistance R is 53.65% higher, the excess series inductance L _x is 3.99% lower and the maximum frequency f _max is improved by 6.47% compared with the conventional class E amplifier. The theoretical analysis is verified by numerical results and harmonic balance simulations. And a lumped element test board is built and measured at 200%MHz utilising a lateral double diffused metal oxide semiconductor (LDMOS) transistor MRF21010 as the switching device. An output power of 33.03%dBm, a drain efficiency of 85.6% and a gain of 16%dB are measured. The approximate transmission-line topology with harmonics suppression is also proposed.