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A low pass filter

  1. Feb 4, 2006 #1
    Q: Derive an expression for the Vout/Vi, the ratio of the output and source voltage amplitudes, as a function of the angular frequencie W of the source.

    The L-R-C circuits looks like this..

    source(ac)----------capacitor-----inductor----resistor----(back to start)

    Vout is taken "between" the source and resitor and between the capacitor and inductor.

    A: Well i know som formula but I can't really identify anything or understand how to set-up the problem...

    maybe someone could explain the problem in easier terms and maybe give me a push in the right direction.

  2. jcsd
  3. Feb 5, 2006 #2

    George Jones

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    So, this is a series circuit, with V_out = V_C, the voltage across the capacitor.

    What do you know about the voltages across the individual components in a series circuit? The currents throught the individual components? The total impedance in terms of the impedances of the individual components?

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