Is this formula right for input impedance hie?

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SherlockBenedict

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I have forgotten the formula for hie

is this right? -

hie= ηVT / Ib
 

Dear SherlockBenedict
Hi
Hie=rpi =beta*re or beta*26mv/IC (or IE) 26mv= VT at 27 C . thus hie =vt/ib ======> 26mv/ib .
Best Wishes
Goldsmith
 

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