Seagate ST373455SS Cheetah 15K.5 SAS Product Manual - Page 76
Zero-length test load, ISI loss example at 3.0 Gbps, ISI loss
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Figure 24 shows the zero-length test load. 10 nF 50 ohm Tx+ Probe points 10 nF 50 ohm Tx- SAS internal connector Figure 24. Zero-length test load Figure 25 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 25. ISI loss example at 3.0 Gbps Figure 26 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 26. ISI loss example at 1.5 Gbps 70 Cheetah 15K.5 SAS Product Manual, Rev. E
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Cheetah 15K.5 SAS Product Manual, Rev. E
Figure 24 shows the zero-length test load.
Figure 24.
Zero-length test load
Figure 25 shows an ISI loss example at 3.0 Gbps.
Figure 25.
ISI loss example at 3.0 Gbps
Figure 26 shows an ISI loss example at 1.5 Gbps.
Figure 26.
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