Doherty Power Amplifiers Move to mmWave - Designing an Efficient 28GHz PA

Rob Smith (PRFI Ltd) presenting at Interlligent UK's 2023 RF & Microwave Design Seminar.
This presentation discusses the design of a Doherty MMIC for the 28 GHz 5G frequency band and the challenges which increase as the frequency of operation moves towards mmWave.
Power amplifiers at mmWave are less efficient than those at lower frequencies, so improving this efficiency is key to accelerating the adoption of mmWave frequencies for commercial use. The Doherty topology can achieve higher efficiencies at back-off without the need for external control circuitry, making it simple to integrate in RF and microwave sub-systems.
This talk described the design of a Doherty MMIC for the 28 GHz 5G frequency band. The efficiency improvements compared to a conventional PA are demonstrated through measurement, and details of the design, simulation, layout, and packaging will be described