[SI-LIST] Length of Discontinuity

Hello,

I was wondering if there are any rules of thumb or formulas as to how the
length of an impedance discontinuity will effect a signal, related to it's
rise time?

For example I heard a general rule would be, keep the electrical length
under 10% of the signal rise time. So about 0.6inches of FR4 with a 1ns rise
time?

Is there any literature as to how the placement/size of the discontinuity
affects the signal?

Cheers

Andrew




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