[SOLVED] BJT switching times ( fall time and rise time approximations )

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Robotduck

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Can someone please help me understand the approximations that are made in this attached handout.
In calculation of rise time the Q is assumed to be off but in reality it is in active region ?
Second, in calculation of fall time , Q is assumed to be a constant current source but in reality the current is changing ?

Thank you
 

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Is it because during Rise time, the BJT is not in true active region ? Because base current is negative.
 

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