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Tackling GaN Measurement Challenges

4/9/2012 02:00 PM EDT
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Steve.Picotest
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See how to measure the world's fastest power switch
Steve.Picotest   5/20/2015 6:22:57 PM
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Nice article, Randy. This is the year of the GaN. The probe I use for high voltage GaN is your TPP0850, which has a 500ps rise time. For low voltage devices your 9GHz low Z probe works well. I also have an article on measurement T challenges of GaN coming in IEEE Power Electronics Magazine next month. I calculated the minimum measurement bandwidth required (5.5GHz for the devices I measured). Since these waveforms can have quite a bit of jitter, I don't recommend D averaging, but high sample rate scopes can use interleaved sampling, such as hi-res. In the IEEE article I also tackle how to measure the Drain current T at these speeds. Look for more from me on GaN this year including the need for integrated EM PCB models, since the PCB dominates the switch performance. You'll also find details about measuring edges at these speeds in my new book, Power Integrity from McGraw-Hill

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