Re: RC Transmission Lines (Wafer-Scale)

Guy Macon wrote:
I recently got into a conversation in comp.arch concerning
how fast signals propagate and how far they can travel in
microprocessor wiring.

Some of the posters seem to think that wafer-scale traces/wires
are a lot slower than PWB-scale and system-scale traces/wires
because they are RC transmission lines, not LC.

I did a few crude simulations and it seems to me that the
RC slows down the risetime on single edges and cuts the
amplitude way down on high frequency clock signals, but I can't see any reason to think that the propagation would
be a lot slower than the usual 60%-80% of C rule of thumb.

I am familiar with normal board and system level transmission
lines such as ECL, stripline, coax, etc., but have never done
any work with chip-scale electronics. Does anyone here know how fast and how far one can move a signal across a die? Thanks!

The RLC transmission occurs when the series loss component is too high to "ignore" also adds delay to the propagation time. The classic wave equation and simpliciation all use transmission constant, with rsitive looss it is a complex ni,ber, hance larger for the same L and c and hence slower...

Marc
.

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