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Reappraisal of RFPA Modes

This webinar presents recent work that calls into question several well-established principles in RF power amplifier (RFPA) design. Conventional theory usually assumes that the active device current waveform is invariant with output voltage, which leads to some simple mathematical formulations and widely quoted results for power and efficiency. But the “soft” IV knee characteristic of a gallium nitride (GaN) device, along with the inevitable presence of a second harmonic component in the output voltage waveform, cause some substantial changes to these conventional and widely-held results. Presented by: Dr. Steve Cripps, Cardiff University