[SI-LIST] More lossy t-line questions - attenuation per unit length and ln functions
- From: "San Miguel, Shane" <shane.san.miguel@xxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 25 Feb 2003 08:49:25 -0800
List,
The edge rate of a device output is different at it's outputs than at the
tester inputs. To know the correction factor I measure DUT outputs vs. tester
inputs and plot a curve using MSExcel. A formula is derived from the
difference in the curves. No biggie...
The problem is that I don't know the "why's" of it all. Why do I have to use
Excel? Why can't I use my pencil instead?
Instead of basing my conversion formula on measured data, how can I plug in
known impedance (or other transmission line parasitics L/C et al), known
output-edge-rate, and calculate an attenuation factor per unit length? Then I
could plug in the t-line length and know what the signal would look like coming
out the other end before I go fab everything up.
Make sense?
I've been knocking my head against the "attenuation per unit length" for a
while now. Please help a "calculus-ly challenged" individual.....
Thanks much.
Shane San Miguel
Product Engineer
Platform Memory Operations
Intel Corporation
916-356-3211
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