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High Pass Filter with two caps

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Thread Starter

EpicFails

Joined Sep 7, 2012
18
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?
 

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