Why would a circuit not operate exactly as predicted?

Thread Starter

murrdpirate

Joined Sep 19, 2011
5
I designed a filter in Pspice and then built it. The built filter operates close to the design, but the dB drop vs frequency isn't quite as steep as it should be and it stops dropping a bit before it should. What would cause this?
 

Thread Starter

murrdpirate

Joined Sep 19, 2011
5
Well, sort of. I've varied the resistor and capacitor within Pspice to see the effect of variance (within tolerances). While that has an effect, it's pretty negligible. Although it may account for the slightly less steep slope.

Here's the AC sweep of my low pass filter. As you can see, it gets a bit haywire after 2000 Hz.

 
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