Figure 4-25: Microstrip Edge-Coupled Differential Pair; Figure 4-26: Stripline Edge-Coupled Differential Pair - Xilinx RocketIO X User Manual
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PCB Design Requirements
vicinity of the obstacle to correct for the impedance discontinuity (increase the individual
trace width where trace separation occurs).
Figure 4-25
differential impedance.
Note:
System Design."
RocketIO™ X Transceiver User Guide
UG035 (v1.5) November 22, 2004
and
Figure 4-26
show examples of PCB geometries that result in 100Ω
W
1
Trace
E
= 4.3
r
Reference Plane
Figure 4-25: Microstrip Edge-Coupled Differential Pair
Reference Plane
W
1
Trace
E
= 4.3
r
Reference Plane
Figure 4-26: Stripline Edge-Coupled Differential Pair
For more information about serial backplane traces, see
www.xilinx.com
1-800-255-7778
S
W
2
Trace
H
Dielectric
H
1
S
W
2
Trace
Dielectric
H
2
W
= 6.29 mil (0.160 mm)
1
W
= 6.29 mil (0.160 mm)
2
S = 10 mil (0.254 mm)
H = 5.0 mil (0.127 mm)
Z
= 55.3Ω
01
Z
= 55.3Ω
02
Z
= 100Ω
0DIFF
ug035_ch4_20_022703
W
= 3.0 mil (0.076 mm)
1
W
= 3.0 mil (0.076 mm)
2
S = 6.85 mil (0.174 mm)
H
= 10.0 mil (0.254 mm)
1
H
= 10.0 mil (0.254 mm)
2
Z
= 64.8Ω
01
Z
= 64.8Ω
02
Z
= 100Ω
0DIFF
ug035_ch4_21_022703
Appendix E, "Serial Backplane
R
119
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