Digital Signal Processing Reference
In-Depth Information
0.80 V). Since the transmission line is open-circuited
at the receiver end, this is exactly the result that we expect to find.
4. Draw the next load line, starting at
−
1
.
70 V (
−
0
.
90 V
−
−
0.900 V and 0mA with slope equal
0
.
0167
−
1
until it intersects the transmitter pull-down curve, which
yields the voltage (
to
−
10
.
8) at the transmitter after the
first reflected wave from the receiver reaches it.
5. Continue the analysis until reaching steady state (0.00 V, 0mA).
−
0
.
25) and current (
−
The resulting voltage waveforms at both ends of the line are shown in
Figure 11-24b.
Tx pull-down
50
30
10
Rx
−
10
−
30
Tx pull-up
−
50
−
1.0
−
0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
v
(V)
(a)
2.5
2
1.5
1
Tx
Rx
0.5
0
−
0.5
−
1
−
1
0
1
2
3
4
5
6
7
8
9
10
Time (ns)
(b)
Figure 11-24
(a) Bergeron diagram and (b) transient waveforms for Example 11-4.
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