RE: [SI-LIST] : Traces Impedance without plane

Andrew Ingraham (Andrew.Ingraham@digital.com)
Wed, 6 Jan 1999 17:26:44 -0500

You will not get good impedance control without a ground plane. It may
depend on all nearby components and traces.

If the board is very small, or the frequencies are low, maybe it doesn't
matter.

But if as you say you really need 100 ohms, use a ground plane. Less
crosstalk and emissions too.

Andy

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