Digital Signal Processing Reference
In-Depth Information
L MATRIX [H/M]
3.670E-07
5.28E-08
5.28E-08
3.670E-09
C MATRIX [F/M]
9.00E-11
−
5.70E-12
−
5.70E-12
9.00E-11
Find the crosstalk coupling factors.
10.3 Find FEXT for the pair of traces described in Problems 10.1 and 10.2 if the
coupled region is 40 cm (15.75 inches) in length. Assume that in each case
the signal has a rise time of 250 ps and swings from 0.8V to 1.8V.
10.4 Find NEXT for the pair of traces described in Problems 10.1 and 10.2 if the
coupled region is 40 cm (15.75 inches) in length. Assume in each case that
the signal has a rise time of 250 ps and swings from 0.8V to 1.8V.
10.5 Derive the (10.3) rule of thumb appearing in Section 10.6.1, which shows
that for guard traces on FR4 a via should be separated by no more than
one-tenth of a rise time.
10.6 The inductance and capacitance matrices for the pair of 4-mil-wide mi-
crostrips separated by 4 mils on FR4 used in the simulation appearing in
Figure 10.7 is presented here. The coupled region is 0.3 meter (11.8 inches)
in length, and the aggressor swings from 0 to 1.68V in 0.1 ns. Calculate
NEXT and FEXT.
L MATRIX [H/M]
4.009E-07
9.662E-08
9.662E-08
4.009E-09
C MATRIX [F/M]
1.029E-10
−
2.233E-11
−
2.233E-11
1.029E-10
10.7 Use Figure 10.6 to find
Kb
for a pair of 5-mil-wide half-ounce 50
Ω
strip-
lines on FR4 that are separated by 10 mils.
10.8 The inductance and capacitance portion of an RLGC SPICE model appears
below. What NEXT will appear on the center trace if the two flanking
traces are aggressors, when the aggressors each launch 1.65V pulses with a
0.1-ns rise time? Assume that the coupled length is 0.3 meter (11.8 inches)
and that the model data is presented in meters.
+ Lo = 4.380E-07
+ 1.124E-07 4.327E-07
+ 3.405E-08 1.124E-07 4.380E-07
+ Co = 1.143E-10
+
−
2.935E-11 1.233E-10
+
−
1.356E-12
−
2.935E-11 1.143E-10
