Teledyne LeCroy PCI Express 3.0 Multi-Lead Probe PCIe - Manual (Page 5)

Signal requirements
• The probe requires minimal signal requirements at a given bit error rate at the analyzer at the probe point.
* Inner eye width = 82 ps Minimum (see 1 in the following figure)
* Inner eye height = 52 mVpp Minimum (see 2 in the following figure)
* Maximum signal amplitude 1500 mVpp Maximum (see 3 in the following figure)
• If measurements/simulations are not available, the optimal location is typically at the AC coupling caps near the
transmitter which offers the highest eye margins.
Probe Impedance
• 660 ohm resistance typical
• > 400 ohm impedance to 4 GHz typical
• > 300 ohm impedance to 12 GHz typical