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How does this man get his currents?

  1. Jun 7, 2013 #1
    How does this man get his currents???

    1. The problem statement, all variables and given/known data[/b]

    I'm having a time trying to figure out how these currents are made.

    I don't understand his notation. It seems simple, but it is going the opposite way of what it should be doing because of the diode, right?

    Attached is the circuit and his formulations of the currents.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Jun 7, 2013 #2

    mfb

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    2016 Award

    Staff: Mentor

    f(...) is the current through the diode as function of its voltage. As long as f is unknown, the third equation says nothing interesting.
     
  4. Jun 7, 2013 #3
    We are trying to find what f is.

    Turns out that this turns into the van de pol equation.
     
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