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Calculation of HPF due to output capacitor, with source connected to load?
Calculation of HPF due to output capacitor, with source connected to load?
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Old 27th February 2010, 02:51 PM   #1
wwenze is offline wwenze  Singapore
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Join Date: Mar 2008
Default Calculation of HPF due to output capacitor, with source connected to load?

With the load connected to the source it becomes like this:

Click the image to open in full size.

How to calculate the cut-off frequency in this case? I'm guessing that this would result in a higher cut-off than with only 1 cap and 1 resistor.
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Old 28th February 2010, 03:12 AM   #2
wwenze is offline wwenze  Singapore
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Join Date: Mar 2008
Hmm no replies?

Click the image to open in full size.

Well I did some spices and what I saw - that value of C2 didn't have any effect on the filter. Though thinking about it makes perfect sense as current into the load is negligible vs current through R1 and R2.

Hmm... so no point for huge input capacitors?
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