GaN has exceeded the limits of oscilloscope voltage measurements. Not because of the oscilloscope, but because of the probe transfer function limitations and because of the lack of de-embedding. An additional constraint is that most probes are designed and calibrated using a 50Ω signal generator. Unfortunately, there aren't any power supplies with 50Ω impedance. Clearly a better method of measuring and calibrating oscilloscope probes, at GaN speeds, is needed. In this session I'll provide three methods of accurately measuring oscilloscope probe response, one in time domain and two in frequency domain, one of which uses the oscilloscope as a high frequency Vector Network Analyzer (VNA).
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