- A 3 inch ground wire used with a 10 pF probe induces a 2.8 ns of 10-90% rise time.
- The response also rings when driven from a low impedance source
- Fattening ground wire hardly helps
- Radically shortening the ground loop improves ringing and reduces rise time
- To reduce the ground wire pickup loop area of the probe, ground the probe near the signal
- Keep the ground probe as short as possible
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High speed digital design fundamentals - Probes
