11 Oct '17, 9am

Doherty Amplifier Combines High Power and Efficiency

Doherty Amplifier Combines High Power and Efficiency

Another circuit implementation of a high-power asymmetric three-way GaN HEMT Doherty amplifier to operate across the frequency bandwidth of 1.8 to 2.2 GHz, where a half-wave microstrip line is included in the load network of each identical peaking path for better flexibility in practical implementation is shown in Fig. 4b , while providing sufficient bandwidth capability at the same time. Here, microstrip line (l/4 + l/2) with a total electrical length of 270 deg. provides the corresponding impedance transformation at significant power backoff and the quarterwave microstrip line in each input path of the peaking amplifiers compensate for the delay provided by the output combiner. The broadband output impedance transformation with 50-Ω load is provided by a Klopfenstein taper having an electrical length of 270 deg. at the center bandwidth frequency.

Full article: http://www.mwrf.com/materials/doherty-amplifier-combines-...

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