CE Input Dynamic Resistance (r_be)

Rarely Tested

$$ r_{be} = \frac{\Delta V_{BE}}{\Delta I_B} \bigg|_{V_{CE}} $$

Small-signal input resistance at base-emitter junction. Approximation: $$ r_{be} \approx \frac{\beta \cdot 25 \mathrm{ mV}}{I_C} $$ with $$I_C$$ in mA.

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