The Doherty power amplifier

In this contribution, the Doherty Power Amplifier (DPA) design concept is focused, discussing about different approaches to optimize its performance. For this purpose, the design, realization and measurement results of three prototypes working at 2.14GHz are presented. The first example is a Tuned Load DPA (TL-DPA) which shown an average drain efficiency of 40.7% with 3W of saturated output power in the obtained 6dB of OBO. The second DPA was designed implementing a Class F harmonic termination for the Main device allowing an improvement of roughly 15% in output power and efficiency levels with respect to the TL-DPA. The last DPA was realized using different bias voltages for the Main and Auxiliary amplifiers with the aim to increase the overall DPA gain.

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