EDI CON Online
Title: Doherty Power Amplifiers – Moving to mmWave
Date: October 6, 2020
Time: 1:00pm PT / 1:30pm ET
Presented by: Dr. Robert Smith, Senior Consultant Engineer, PRFI Ltd.
Doherty power amplifiers are widely used below 6 GHz to improve Power Added Efficiency (PAE) for communications applications. Designing Doherty PAs incurs many challenges, which increase as the frequency of operation moves towards mmWave. LDMOS, which is commonly used below 6 GHz, cannot be used, and more integrated approaches need to be utilized to minimize parasitic inductances and capacitances. Recently, short gate-length GaN-on-SiC MMIC processes have become commercially available, opening up the possibility of realizing medium power, high-efficiency Doherty power amplifiers at mmWave frequencies.
The design of a Doherty MMIC for the 28 GHz 5G frequency band will be described. First pass design success was achieved using an asymmetrical topology designed on the commercially available 0.15 µm G28v5 GaN-on-SiC process from Wolfspeed. The MMIC was packaged in a cost-effective, compact 4x4mm QFN package. Details of the design, simulation, layout, and packaging will be described.
Dr. Robert Smith received his PhD in microwave engineering from Cardiff University in the UK in 2013, specializing in broadband power amplifier design. He subsequently worked for Thales in the Netherlands where he designed transmitter modules for active phased array radar. As a Senior Consultant Engineer at PRFI Ltd., he designs pioneering millimeter-wave compound semiconductor integrated circuits for 5G communications as well as high performance power amplifiers.
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