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Using Thevenin's theorem on a High pass filter with a DC Offset

  1. Sep 3, 2012 #1
    1. The problem statement, all variables and given/known data
    A 1kHz square wave with an amplitude of 2V (peak to peak) is applied at the input V-in of the circuit shown. The resistor R1 = R2 = 10 kΩ, and C = 0.02 μF.

    L8jkF.png

    a) What is the effective time constant of this circuit?
    b) What is the minimum and maximum voltage reached at the output, V-out?

    Hint: If V1, R1 and R2 are replaced by their Thevenin equivalent circuit, then this is just a high pass filter with an offset on the output.

    2. Relevant equations

    V = IR, Kirchoff's Laws, Thevenin's theorem

    3. The attempt at a solution

    My confusion lies with the Hint. Thevenin's theorem requires that the circuit (or network, etc.) has two terminals, an input and an output. From this we can simplify the circuit to a series circuit with a voltage source, V-thevenin, and a resistance R-thevenin. However, here there seems to be three or four terminals (i.e. at where V-in comes in, at V1, at V-out and at the ground) so I have absolutely no clue as to how to decompose this into it's Thevenin equivalent.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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