12:00 pm EDT
Dr. Steve C. Cripps
(advance registration required)
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Waveform engineering has been an important concept in RF power amplifier (RFPA) design, resulting in the definition of important new PA modes. The concept can, however, be taken too far. A set of voltage and current waveforms can be used to define an impedance environment, but that environment will not guarantee that the same waveforms can be reproduced in a practical implementation. The impedance environment is a necessary, but not a sufficient, condition for a specific waveform realization. Widely-touted switch modes are one example of this frequently misunderstood principle. This webinar will illustrate some common misconceptions using various design examples, including both switched and analog cases.
Dr. Steve Cripps obtained his Masters and Ph.D. degrees from Cambridge University in the 1970s. After working for a few years with the pioneering gallium arsenide (GaAs) group at Plessey Research, he emigrated to the U.S., where he spent 15 years working in various engineering and management positions at Watkins Johnson, Loral, and Celeritek. In 1996 he returned to the UK, working as an independent consultant before taking on an academic post at Cardiff University, where he is currently a distinguished research professor. Dr. Cripps has authored several best-selling books on RFPA design and is a regular contributor to the IEEE Microwave Magazine with his popular “Microwave Bytes” column. Dr. Cripps is a fellow of the IEEE and was the 2008 recipient of the IEEE Microwave Application Award.