[SI-LIST] Re: Series termination value
- From: "Tabatchnick, Justin" <justin.tabatchnick@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 22 Mar 2002 13:03:49 -0800
I have to jump in here but from the looks of things this is just a standard
transmission line problem. Impedance seen by the driver is a function of the
load impedance, the line characteristic impedance , the distance between the
impedance reference point ( in this case the 20 ohm resistor) and the load
impedance, and the wave length. The wave length in this case is about 1000
inches ( in air ) and since your trace is probably less then a foot , I
would say that you can treat this as a DC problem with the total load
impedance seen by the driver as 91 ohms. I don't see a problem with
attenuation due to loss or mismatch.
Justin Tabatchnick
SI Group
Intel, Sacramento
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