Blackman's impedance formula (Open loop gain)

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Electro_vass
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Homework Statement


Determine the input resistance using blackmans impedance formula.
I know all the ressisor values, and transistor data.

Homework Equations


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Blackmans impedance formula

The Attempt at a Solution



Our teacher has given us a example on how to find the open loop gain, but I don't understand what he has done. Do anyone know how he has found the open loop gain?
Bilde uten tittel.png
Bilde uten tittel.png
 
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Electro_vass said:
Do anyone know how he has found the open loop gain?
What is it, specifically, you're not sure about?

Note that the circuit shown is just a current divider.