Here's a short answer:
> Question: Ignore fab tolerances for the moment.
>
> At what point does the controlled impedance of the
> trace begin to be compromised by 1%, 10%, 20% ... ?
I don't know.
> Could I in fact reduce the width of the ground planes
> down to 5 mils, equal to the width of the trace,
> without compromising impedance?
Not without changing something else (dielectric spacing, etc.)
Tim Reeves
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