Seagate ST3300457FC Cheetah 15K.6 SAS Product Manual - Page 80

Zero-length test load, ISI loss example at 3.0 Gbps, ISI loss

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Figure 22 shows the zero-length test load. 10 nF 50 ohm Tx+ Probe points 10 nF 50 ohm Tx- SAS internal connector Figure 22. Zero-length test load Figure 23 shows an ISI loss example at 3.0 Gbps. S21 (dB) 0 Compliance interconnect magnitude response and ISI loss example for 3.0 Gbps ISI loss > 3.9 dB -10.9 dB 0.3 1.5 Sample compliance interconnect Frequency (GHz) 3.0 Figure 23. ISI loss example at 3.0 Gbps Figure 24 shows an ISI loss example at 1.5 Gbps. S21 (dB) 0 Compliance interconnect magnitude response and ISI loss example for 1.5 Gbps ISI loss > 2.0 dB -5.4 dB 0.15 0.75 Sample compliance interconnect Frequency (GHz) 1.5 Figure 24. ISI loss example at 1.5 Gbps 76 Cheetah 15K.6 SAS Product Manual, Rev. B

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76
Cheetah 15K.6 SAS Product Manual, Rev. B
Figure 22 shows the zero-length test load.
Figure 22.
Zero-length test load
Figure 23 shows an ISI loss example at 3.0 Gbps.
Figure 23.
ISI loss example at 3.0 Gbps
Figure 24 shows an ISI loss example at 1.5 Gbps.
Figure 24.
ISI loss example at 1.5 Gbps
Tx+
Tx-
10 nF
50 ohm
50 ohm
Probe
points
SAS internal connector
10 nF
ISI loss
> 3.9 dB
-10.9 dB
Frequency (GHz)
Sample compliance interconnect
0
3.0
1.5
0.3
S
21
(dB)
Compliance interconnect magnitude response and
ISI loss example for 3.0 Gbps
ISI loss
> 2.0 dB
Frequency (GHz)
Sample compliance interconnect
0
1.5
0.75
0.15
S
21
(dB)
Compliance interconnect magnitude response and ISI
loss example for 1.5 Gbps
-5.4 dB