Technical Education Webinar Series
Title: Addressing Instability in Wide Bandwidth High Power Amplifiers
Date: December 4, 2019
Time: 9am PT / 12pm ET
Sponsored by: National Instruments
Presented by: Dr. Dominic Fitzpatrick, Head of Amplifier Development, AMETEK-CTS
Addressing stability in power amplifiers (PAs) over wide bandwidths is one of the biggest challenges that RFPA designers must overcome. Standard techniques include adding resistive (lossy) elements, however, this approach may cause problems with heat dissipation and a reduction in amplifier efficiency. Furthermore, PAs connected directly to antennas face additional instability issues in that the antenna load impedance can vary considerably, resulting in potential oscillations. A suitable stabilization strategy, validated through circuit simulation, is required to ensure that the amplifier is unconditionally stable regardless of the source/load impedances. This webinar discusses the use of stability analysis in Microwave Office circuit design software to identify the conditions leading to device instability and implement acceptable stabilizing solutions through circuit simulation in a 200-W, wideband power amplifier (PA).
Dr. Dominic Fitzpatrick has been involved with the design of solid state RF & microwave amplifiers for over 30 years. He holds a B.Sc. and an M.Sc. in solid state microwave physics from the University of Portsmouth, England, and a Ph.D. from Cardiff University, Wales. He has been the Technical Director of two UK companies designing and manufacturing RF/microwave frequency, Solid-State PAs (SSPAs) and in 2010 he started PoweRFul Microwave, a consultancy specializing in SSPAs. In April 2019 Dr. FitzPatrick joined Ametek-CTS as the Head of their Amplifier Development. He is a co-author of The Handbook of RF and Microwave Power Amplifiers, Cambridge University Press.
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