High Pass Filter with two caps

Discussion in 'Homework Help' started by EpicFails, Mar 21, 2013.

  1. EpicFails

    Thread Starter New Member

    Sep 7, 2012
    18
    0
    Hi,

    I'm trying to get my head around a situation I've encountered. I have an AC source signal which has an equivalent capacitance. It is entering a DC circuit, via a coupling cap and an RLoad.

    I have attached a (very bad!) drawing of this.

    I am trying to treat this as a first-order HPF, but with two caps and one resistor.

    In my initials calculations, I've been treating the two caps as one by combining them (C1 x C2) / (C1+C2). I have then been calculating the frequency cutoff as per 1 / 2∏RC.

    Is this a viable way to treat this situation?
     
  2. WBahn

    Moderator

    Mar 31, 2012
    17,737
    4,789
    At a quick glance it looks like you are okay.
     
    EpicFails likes this.
  3. EpicFails

    Thread Starter New Member

    Sep 7, 2012
    18
    0
    Okay, thanks. Will put it through SPICE and see what I get.

    Cheers
     
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