Date: Wed May 10 2000 - 10:35:24 PDT
In a message dated 5/10/00 9:57:38 AM Pacific Daylight Time,
<< This is an interesting experiment. As others have pointed out, lower
lines will have a higher current if the voltage is the same. Did you keep
voltage or the current constant when you switched impedances?
The voltage was held constant. For easy recall, you were referring to the
"Although I do not know (nor does the EMCAD1 literature indicate) the
boundaries within which their software/equations apply, I agree with you. My
tests on a demonstration board with 50 ohm and 100 ohm microstrip traces
(verified by HP TDR equipment) indicated field increases of 8-9 dB for the
100 ohm line relative to the 50 ohm line. This result is between the 6 dB
and 12 dB boundaries of our discussion. Isn't that always the way it is?"
Michael L. Conn
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