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Old 12th December 2016, 06:17 PM   #1
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Default Cascoded MOSFETs OPS for class D?

I'm reading about the benefits of cascoded transistors (i.e. stacking series transistors reduces Miller capacitance and provides strong input / output isolation). I know from my PWM motor controller designs that Miller effect can wreak havoc; when the dv/dt is too fast the mosfet may turn back on one or more times before settling off, which is NOT GOOD. Anyway it got me wondering: has anyone here done a DIY class D design that uses cascoded transistors for the OPS? It should be capable of achieving higher switching frequencies than typical class D. Although going above the Nyquist frequency would seem to provide no benefit, I'm thinking that if the frequency were really high there might be enough cycles in an audio wavelength to implement Magic Sine Waves (or maybe a simpler approximation; 60 Hz output requires 4 MHz switching according to something I just read).
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