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Capacity with 2 R in RC circuit

  1. Dec 29, 2015 #1
    1. The problem statement, all variables and given/known data
    Initially we had a circuit with 2 transistor , we draw the equivalent circuit in the dynamic range and low frequency .
    After that we simplified the Circuit by calculatuig Rin after the capacity .
    So what we have left is a voltage source (ac) followed by a resistor followed by a capa followed by another resistor . The question is find c given f , we know 1/rc = 2pi f , the problem here is what is r .

    2. Relevant equations
    omega =1/rc

    3. The attempt at a solution
    Is this true . Omega = 1/ (R1 + R2 )c
  2. jcsd
  3. Dec 29, 2015 #2
    i apologize ; apparently we calculate the gain : Av = Vo / Vi , and we deduce the form of omega from there , thank you very much .
  4. Dec 29, 2015 #3
    okey turns out i am too dumb , for this , i thought i understood but it wasn t the case .
    i just can not figure out if we should ignore the resistor before the capacitor , and think of it as part of Vin or not . please help.
  5. Dec 29, 2015 #4


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    Staff: Mentor

    Can you provide a circuit diagram to make the configuration more clear? Show where Vo and Vi are measured.
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