[SI-LIST] Re: Non monotonic EDGE on Clocks
- From: Jim Freeman <freeman@xxxxxxxxxxx>
- To: ahmed.alokby@xxxxxxxxx
- Date: Thu, 14 Mar 2002 19:42:22 -0800
Hi Ahmed,
Perhaps the extra capacitance of the POT also aided in the fix.
Thanks
Jim Freeman
"Alokby, Ahmed" wrote:
> DEAR Folks,
> I have a 14MHZ clock, series terminated with a 30 Ohms resistor that exhibit
> non monotonic edge. Since my output driver has very wide range of output
> impedance (20-60 Ohms) my initial reaction was to adjust the termination
> resistor to get red of this problem. I replaced the 603 termination
> resistor with a through hole POT keeping the wires between the POT and the
> resistor pads to a minimum length. When dialing the POT I was able to find
> a value that completely eliminated the reflection on the clock. However,
> when I replaced the POT with a discrete 603 resistor with equal value the
> edge comes back. Can one explain this to me?
>
> Ahmed
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