- #1
TFM
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Homework Statement
Showing how to get:
[tex] Z_{out} = \frac{Z_{in}}{h_F_E + 1} [/tex]
from
[tex] \Delta I_E = \Delta V_B/R [/tex]
Homework Equations
[tex] \Delta I_E = \Delta V_B/R [/tex]
[tex] Z_{out} = \frac{Z_{in}}{h_F_E + 1} [/tex]
[tex] \Delta V_E = \Delta V_B [/tex]
The Attempt at a Solution
I am trying to prove the above, but the book makes quite a large jump (again, "The Art of Electronics")
It goes from:
[tex] \Delta I_E = \Delta V_B/R [/tex] - (1)
straight to
[tex] \Delta I_B = \frac{1}{h_{FE} + 1}\Delta I_E = \frac{\Delta V_B}{R(h_{FE} + 1)} [/tex] -(2)
Can anyone help show how they've gone from (1) to (2)?
Thanks,
TFM