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  1. #1
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    BJT switching times ( fall time and rise time approximations )

    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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  2. #2
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    Re: BJT switching times ( fall time and rise time approximations )

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



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