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VI = High (V2) to Low (V1)
- VI = V1
- iB = increases from IB1 toward zero
iC = 0.
- Emitter junction goes from zero bias to reverse bias
- During which iB = (0.7 - V1)/R or -V1/R
or IB1 ==> 0
- iB(t) = IB1 exp(-t /RC)
- C = Cje because only the Emitter junction is being changed.
- R = RB