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In Reply to: RE: "cap distortion" in spice. posted by dave slagle on December 04, 2014 at 07:38:25
Um.
Unless I misunderstand what you are concerned about, that just looks like the capacitor is behaving as a high-pass filter against the varying load resistor. The filter corner frequency (and associated phase shifts) depend on the product of R*C. It's not a nonlinear distortion, it's the characteristic of music being played through a filter of different characteristic. That's pretty much the reason for capacitors to exist, it's what they do for a living.
Subtracting one signal from another is an EXTREMELY sensitive test, anything different, particularly including linear filtering responses, will show dramatically.
Unless I'm missing something.
Follow Ups:
I suspect you're correct regarding the results as simply the output of a simple RC filter passing music. So the next simulation should be performed with the 10K load and vary "C" @1X, 10X & 100X and then compare the "residual" to 1XC@R = 10K, 100K and 1000K.Knowing more about the model would remove the need to speculate.
Edits: 12/04/14
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