Digital Signal Processing Reference
In-Depth Information
300
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0
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0
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2.8
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4.2
Time (ns)
(a)
300
250
Max low-high swing
200
150
Min low-high swing
100
50
0
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Min high-low swing
150
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Max high-low swing
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0
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0.8
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1.2
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1.8
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2.2
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2.6
2.8
3
3.2
3.4
3.6
3.8
4
4.2
Time (ns)
(b)
300
250
Max low-high swing
200
150
Min low-high swing
100
50
0
−
50
−
100
−
150
Max high-low swing
−
200
Min high-low swing
−
250
−
300
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
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2.8
3
3.2
3.4
3.6
3.8
4
4.2
Time (ns)
(c)
Figure 12-19
Example signal waveforms with passive CTLE: (a) transmitter output;
(b) received input; (c) equalized output.
to providing perfect equalization (compare Figures 12-12 and 12-16). However,
the equalizer compensates sufficiently for the loss of the 0.381-m PCB trace to
increase the eye height by more than 400% for a 10-Gb/s data signal (from 10
to 50 mV).
Another example of a passive equalizer from Sun et al. [2005] based on a
high-pass
RLC
filter is shown in Figure 12-20. In this case we show versions
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