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Homework Help: Blackman's impedance formula (Open loop gain)

  1. Mar 21, 2015 #1
    1. The problem statement, all variables and given/known data
    Determine the input resistance using blackmans impedance formula.

    I know all the ressisor values, and transistor data.

    2. Relevant equations

    Blackmans impedance formula

    3. The attempt at a solution

    Our teacher has given us a example on how to find the open loop gain, but I dont understand what he has done. Do anyone know how he has found the open loop gain? Bilde uten tittel.png Bilde uten tittel.png
  2. jcsd
  3. Mar 21, 2015 #2
    What is it, specifically, you're not sure about?

    Note that the circuit shown is just a current divider.
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