RC Transmission Lines (Wafer-Scale)




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!

--
Guy Macon
<http://www.guymacon.com/>

.

Relevant Pages

  • Re: RC Transmission Lines (Wafer-Scale)
    ... how fast signals propagate and how far they can travel in ... I am familiar with normal board and system level transmission ... Prop delay versus distance is a serious issue with layout on a Xilinx ...
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  • Re: RC Transmission Lines (Wafer-Scale)
    ... Some of the posters seem to think that wafer-scale traces/wires ... amplitude way down on high frequency clock signals, but I can't see any reason to think that the propagation would ... I am familiar with normal board and system level transmission ...
    (sci.electronics.design)
  • Re: RC Transmission Lines (Wafer-Scale)
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