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Detecting parasitics?

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Veriloger

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Is there a way to approximate the parasitics of a circuit at a given frequency by measuring the response waveform from an input? Would an FFT highlight anything?
 

crutschow

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You could, if you knew the circuit low frequency impedance, by measuring the rolloff of the response with frequency.
 

Veriloger

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You could, if you knew the circuit low frequency impedance, by measuring the rolloff of the response with frequency.

Please could you explain further or give me some buzz words that i could use to search for pages that will explain it?
 

dick_freebird

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One problem is, for a circuit of some complexity, the
parasitics are distributed and can combine in many
ways (in the same circuit). You can have shunt and
feedforward, in various places and proportions. A
single-pole or few-pole, or few-poles-plus-zeroes,
might be discernible in the details from a gain/phase
vs frequency plot (if you have the schematic in hand)
but how many can sit on top of each other and still
let you pick them out of the tangle, quantitatively?
 

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