[SI-LIST] Non monotonic EDGE on Clocks
- From: "Alokby, Ahmed" <ahmed.alokby@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 14 Mar 2002 18:58:22 -0800
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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