Digital Signal Processing Reference
In-Depth Information
0.2V
Separation = 4 mil
0.1V
Separation = 12 mil
0.0V
Guard trace
0s
1 ns
2 ns
Figure 10.9
Simulation results for Figure 10.8. NEXT falls from 215 mV when the aggressor and
victim separation is 4 mils (0.13 mm) to 55 mV when it is increased to 12 mils (0.32 mm). Inserting
a guard trace reduces NEXT to 10 mV.
The FEXT pulse has the same polarity as the aggressor when capacitive
coupling dominates, but has opposite polarity when inductive coupling
dominates.
•
Guard traces can be effective in reducing NEXT and FEXT, but only when
properly grounded.
•
Problems
Answers to these problems are available on the Artech House Web site at http://
www.artechhouse.com/static/reslib/thierauf/thierauf1.html.
10.1
A field solver has produced the following data for a pair of 8-mil-wide, half-
ounce striplines, separated by 10 mils:
L MATRIX [H/M]
4.447E-07
8.28E-08
8.28E-08
4.447E-09
C MATRIX [F/M]
1.088E-10
−
2.025E-11
−
2.025E-11
1.088E-10
Find the crosstalk coupling factors.
10.2
10.2 A field solver has produced the following data for a pair of 8-mil-wide,
half-ounce microstrips, separated by 10 mils:
