Seagate ST300MP0004 Savvio 15K.1 SAS Product Manual - Page 74

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

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Figure 20 shows the zero-length test load. Tx+ Tx- 10 nF 50 ohm Probe points 10 nF 50 ohm SAS internal connector Figure 20. Zero-length test load Figure 21 shows an ISI loss example at 3.0 Gbps. S 21 (dB) 0 Compliance interconnect magnitude response and ISI loss example for 3.0 Gbps ISI loss > 3.9 dB -10.9 dB Sample compliance interconnect 0.3 1.5 3.0 Frequency (GHz) Figure 21. ISI loss example at 3.0 Gbps Figure 22 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 Sample compliance interconnect 0.15 0.75 1.5 Frequency (GHz) Figure 22. ISI loss example at 1.5 Gbps 68 Savvio 15K SAS Product Manual, Rev. C

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68
Savvio 15K SAS Product Manual, Rev. C
Figure 20 shows the zero-length test load.
Figure 20.
Zero-length test load
Figure 21 shows an ISI loss example at 3.0 Gbps.
Figure 21.
ISI loss example at 3.0 Gbps
Figure 22 shows an ISI loss example at 1.5 Gbps.
Figure 22.
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