Does it make sense to design a closed loop circuit for bias control of a 28V or 50V GaN amplifier?
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HMC920
Recommended for New Designs
HMC920LP5E is an active bias controller which generates a regulated Drain voltage and actively adjusts the gate voltage of an external amplifier to achieve...
Datasheet
HMC920 on Analog.com
Does it make sense to design a closed loop circuit for bias control of a 28V or 50V GaN amplifier?
You could do this but we have not covered it in this webinar. Most of the ADI's GaN amplifiers are designed for use in radar application where the amplifier must be turned on and off very quickly, typically in the sub 1us range. It's not really practical to design a closed loop circuit with negative feedback which can switch on an off at that speed.