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Simulating Dynamic Load Modulated Amplifiers – an Alternative Solution to Maintaining Efficiency over a Power Range
Date & Time:
June 18, 2014; 8am PT/ 11am ET/ 3pm UTC
Dominic FitzPatrick, Specialist Consultant in RF and Microwave Amplifier Design, PoweRFul Microwave
It is interesting how many of the techniques for improving amplifier performance, such as Doherty and Envelope Tracking, have their roots in early days of Vacuum Tube Devices, and so it is with Dynamic Load Modulation. The latest generation of device technology and the introduction of nonlinear simulation tools have breathed new life into this latter technique.
This presentation will introduce the concept of Dynamic Load Modulation and demonstrate how amplifiers can be designed using this approach. The ability of the modern CAD tools to model nonlinear components, such as varactor diodes, using discrete components and parameterised variables will be covered. This capability, coupled with the nonlinear models of GaN FET devices, gives the designer access to a fully dynamic simulation of the amplifier, opening up numerous other possibilities for performance improvement.
Dr. Dominic FitzPatrick is the Principal Consultant at PoweRFul Microwave. He has specialized in RF & Microwave Solid State Amplifier technology since 1984. As Technical Director of two British microwave amplifier companies, he was responsible for technological innovation and new product development, serving customers worldwide. In 2007 he began a three year research project at Cardiff University focused on novel ultra wideband design techniques, a PhD program funded by the UK Defence Technology Centre. Dominic's other credentials include a B.Sc. in Electrical & Electronic Engineering and a Masters in Solid State Microwave Physics, both from Portsmouth University. He has an Industrial Studies Diploma jointly awarded by Portsmouth Polytechnic and the Marconi Company. He is the author of the chapter on Microwave Hybrid Amplifier Realization, in the recent publication Handbook of RF and Microwave Amplifiers, Cambridge University Press.
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