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by hollandays
1179 days ago
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You ask good questions so I'll give very short "answers" to get you started in your search for good explanations. The tests are frequency sweeps, one frequency at a time over multiple frequencies. Linear models can be decomposed into individual sine waves via Laplace/Fourier transform, so it's valid as long as the model is valid. The input voltage looks like a DC (bias) voltage plus ripple (RF). The frequency response of some capacitors depends strongly on the DC bias (the trap). All capacitors flip to being inductive above the self-resonant frequency (SRF). Good test equipment is expensive, but there are options for hobbyists. A test like that can't predict the response for other inputs and conditions, so you need a model of the dynamics. |
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