microstrip capacitances

John Larkin · 2022-12-15T20:52:39+00:00

Given a pair of parallel run traces on a board, FR4, like this,There are three capacitances per unit length.Assume w = 6 mils and g = 6 mils and the upper dielectric is 10 milsthick, traces to ground. What are the capacitances? I'm not concernedwith transmission line effects now.The Saturn software says that one trace by itself is 1.8 pf per inch.It will also calculate odd and even mode impedances for a differentialmicrostrip, but not these capacitances directly.I can find academic papers on this, full of gigantic equations but nonumbers. I suppose I could write a program to evaluate the equations.I was prowling the net for a calculator but couldn't find one.C3 will be an unfortunate routing between a fast DAC and its opamp,basically from the opamp output to its inverting input.

Dec 15, 2022 Last reply: 3 years ago 21 Replies

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