A 240W dual-band 870 and 2140 MHz envelope tracking GaN PA designed by a probability distribution conscious approach

In this paper, we present the design of a dual-band power amplifier (PA) for envelope tracking (ET) operation. The design was based on a multi-section transmission line matching technique and has taken into account the actual probability distribution function of the WCDMA 3GPP DL signal. The technique was applied to a concurrent 870 and 2140 MHz ET PA designed around a GaN HEMT. The ET friendly design method has proven capable to meet the performance equal to those of each single band pulsed load pull with minor loss, over a bandwidth of 100 MHz, reporting an average drain efficiency of 69.5% and 51.0%, and peak power levels of 54.86 dBm and 53.96 dBm at the design frequencies. A detailed discussion of the design method and validating experimental results data are reported.