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Switching Speed of a BJT

 

Hello,
My question is multiple:
1. What are the influential spice parameters that optimize the switching speed?
To my knowledge, it's mainly Bf that seems to be the most important for increasing the switching speed, which I vary like this:
.step param X LIST 100 150 200 250 300
.model myModel AKO: 2N2222 NPN (Bf={X})
2. What measurement (equation) can be used to measure the speed?
3. What circuit should I use to compare the switching speed results as a function of the influential parameter?
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