Inverse Class E amplifier and oscillator phase noise characteristics

This paper gives the first experimental characterisation of the phase noise response of the recently introduced Inverse class E topology when operated as an amplifier and then as an oscillator. The results indicate that in amplifier and oscillator modes of operation conversion efficiencies of 64%, and 42% respectively are available, and that the excess PM noise added as a consequence of saturated class E operation results in about a 10 dB increase in PM over that expected from a small-signal class A amplifier operating at much lower efficiency. Inverse class E phase transfer dependence on device drain bias and flicker noise are presented in order to show, respectively, that the Inverse class E amplifier and oscillator follow the trends predicted by conventional phase noise theory.