AD8155
DATA OUT
PATTERN
GENERATOR
50Ω CABLES
2
2
TP1
50Ω CABLES
FR4 TEST BACKPLANE 2
2
DIFFERENTIAL
STRIPLINE TRACES
TP2
8mils WIDE, 8mils SPACE,
8mils DIELECTRIC HEIGHT
TRACE LENGTHS = 20 INCHES,
40 INCHES
INPUT OUTPUT
PIN
PIN
AD8155
AC-COUPLED
EVALUATION
BOARD
50Ω CABLES
2
2
TP3
50Ω
HIGH
SPEED
SAMPLING
OSCILLOSCOPE
25ps/DIV
REFERENCE EYE DIAGRAM AT TP1
Figure 7. Input Equalization Test Circuit
25ps/DIV
Figure 8. 6.5 Gbps Input Eye, 20 Inch FR4 Input Channel (TP2 from Figure 7)
25ps/DIV
Figure 10. 6.5 Gbps Output Eye, 20 Inch FR4 Input Channel (TP3 from Figure 7)
25ps/DIV
Figure 9. 6.5 Gbps Input Eye, 40 Inch FR4 Input Channel (TP2 from Figure 7)
25ps/DIV
Figure 11. 6.5 Gbps Output Eye, 40 Inch FR4 Input Channel (TP3 from Figure 7)
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