I don't know if this is part of _______........._____
what you're looking for, but one / \ area /
can estimate lumped capacitance / \_____/
from a TDR trace by measuring or /
estimating the area of a negative /
reflection due to the capacitance. /
This area is Z0*C/2, where Zo is ___/
the line characteristic impedance.
By the way, if one replaces "negative" by "positive" reflection,
shunt capacitance by series inductance (a connector, for instance),
and Zo*C/2 by L/(2*Zo), one can estimate parasitic inductance, L.
These formulas are exact, & based on the LaPlace Final Value Theorem.
Regards,
Mike
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Mike Jenkins Phone: 408.433.7901 _____
LSI Logic Corp, ms/G750 Fax: 408.433.2840 LSI|LOGIC| (R)
1525 McCarthy Blvd. mailto:[email protected] | |
Milpitas, CA 95035 http://www.lsilogic.com |_____|
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