A novel Load Modulated Envelope Tracking PA technique

This paper shows the preliminary results of combining load modulation and envelope tracking, to get a large RF bandwidth with good efficiency in backoff. This Load Modulated Envelope Tracking (OLMET) combination method, is a Doherty like topology, without the bandwidth limiting quarter wave long lines. The technique is , in itself , independent of RF bandwidth. The only RF bandwidth limiting parts in this technique are the RF bandwidth of the amplifiers itself and a power splitter. Preliminary simulation results for a GaN MMIC process, show drain efficiency above 40% at 12dB backoff and a bandwidth of 1.2Ghz centred around 2.2Ghz.