[SI-LIST] : differential impedance calculations

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From: Gary Peterson (Gary_Peterson@Emcore.com)
Date: Wed Nov 01 2000 - 12:50:37 PST


I seem to recall Dr. Howard Johnson mentioning that impedance calculation
formulas made assumptions (since closed-form solutions aren't possible).

Can someone comment on assumptions made for the equation for differential
impedance shown below? Seems to me that as traces get closer together, the
single ended impedance would be affected. When I calculate single-point
values for differential impedance using Hyperlynx LineSim, I do see the
single-ended impedance change when the spacing between the pair gets small.

Thanks,

Gary Peterson

(Embedded image moved to file: pic27894.pcx)



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