Figure Q6 shows the cross-section of the typical layout of two tracks (A and B) on a printed circuit board with a ground plane C. The tracks are terminated as shown in the figure, with track A carrying digital signals. You can assume that the lines are electrically short. (a) Describe the electromagnetic coupling (crosstalk) between tracks A and B. (b) Draw the equivalent circuit that models the crosstalk and write down a relation between the voltage applied to track A and the voltage coupled on to track B at low frequencies, VNE.

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Publisher:Robert L. Boylestad
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Page 4 of 5
06
Figure Q6 shows the cross-section of the typical layout of two tracks (A and B) on a
printed circuit board with a ground plane C. The tracks are terminated as shown in the
figure, with track A carrying digital signals. You can assume that the lines are
electrically short.
(a)
Describe the electromagnetic coupling (crosstalk) between tracks A and B.
(b)
Draw the equivalent circuit that models the crosstalk and write down a
relation between the voltage applied to track A and the voltage coupled on to
track B at low frequencies, VNE.
(c)
If the total mutual inductance between the two tracks Lm = 9 nH, and the total
mutual capacitance between the two tracks is Cm = 2 pF, calculate:
(i)
the amplitude of the near-end pulse VNE-
(ii)
the amplitude of the near-end pulse VNE if the driven line is terminated
in a short circuit instead. Comment on the crosstalk.
(d)
How would you reduce the crosstalk?
B
C
50 2
50 2
V
A
B
50 Ων.
V. 50 2
Vt) 1
5V
50 ns
50 ns
1 us
Figure Q6
End of question paper
Page 5 of 5
Transcribed Image Text:Continued overleaf Page 4 of 5 06 Figure Q6 shows the cross-section of the typical layout of two tracks (A and B) on a printed circuit board with a ground plane C. The tracks are terminated as shown in the figure, with track A carrying digital signals. You can assume that the lines are electrically short. (a) Describe the electromagnetic coupling (crosstalk) between tracks A and B. (b) Draw the equivalent circuit that models the crosstalk and write down a relation between the voltage applied to track A and the voltage coupled on to track B at low frequencies, VNE. (c) If the total mutual inductance between the two tracks Lm = 9 nH, and the total mutual capacitance between the two tracks is Cm = 2 pF, calculate: (i) the amplitude of the near-end pulse VNE- (ii) the amplitude of the near-end pulse VNE if the driven line is terminated in a short circuit instead. Comment on the crosstalk. (d) How would you reduce the crosstalk? B C 50 2 50 2 V A B 50 Ων. V. 50 2 Vt) 1 5V 50 ns 50 ns 1 us Figure Q6 End of question paper Page 5 of 5
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