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Home > Designing the Target Board for Tracing > Probe modeling |
For TRACECLK frequencies above 100MHz, it is recommended that modeling is used. The characteristics for the RealView® Trace probe are:
The Mictor connector single line model can be downloaded directly from the AMP web site. The closest available model is entitled MICTOR, .025" PITCH, 2 ROW, VERTICAL PLUG TO VERTICAL RECEPTACLE, 0.260" [6.6mm] HEIGHT .
The connector assembly (plug and receptacle together) can be viewed as a transmission line with an impedance of 45Ω and a propagation delay of 39ps. For more accurate modeling, multi-line models can be requested from AMP.
All traces are microstrips (on outer layers over ground planes).
All traces are designed to a target impedance of 50Ω ± 2Ω.
Trace lengths from Mictor to input buffers are 0.329 inches maximum and 0.193 inches minimum.
Average trace separation is 0.010 inches.
Er
= 4.5.
The probe input buffers are a mixture of Fairchild FIN1104MTD and FIN1108MTD devices (4 channel & 8 channel devices respectively).
The datasheets, ibis
and hspice
models
for these devices are available on the Fairchild web site.
AMP web site http://www.amp.com
Models at AMP http://www.amp.com/simulation/scripts/models.asp
Fairchild web site http://www.fairchildsemi.com