Is there any way to get Protel to add vias to an overall trace length? Ex. A
via going from top to bottom thru an .062" board would add .062" to a total
trace length (PCAD/ACCEL does this).
Sean,
I don't think .062 inch for any digital signal under 500 mhz makes any
difference. The actual capacitance of the via will pose more of a problem
than the trace length. Actual measurements made by Bill Brooks
www.ultracad.com and contributing editor to PCD magazine shows no relevant
impedance changes with vias placed in a trace. There are little hic-cups in
the impedance but it really doesn't change much. I wish protel would give
me a calculation of the capacitance with the via included. A trace length
is irrelevant unless it approaches a critical length for the signal, but
loss can become a bigger factor.
Question; Why don't you use Acell PCAD? personally I think it sucks
Mike Reagan
EDSI
Frederick MD
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