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AD8155

50Ω CABLES

Rev. 0 | Page 11 of 36

TP3

HIGH

SPEED

SAMPLING

OSCILLOSCOPE

50Ω CABLES

50Ω

AD8155

AC-COUPLED

EVALUATION

BOARD

INPUT

OUTPUT

PATTERN

GENERATOR

DATA OUT

TP1

50Ω CABLES

TP2

FR4 TEST BACKPLANE

DIFFERENTIAL

STRIPLINE TRACES

8mils WIDE, 8mils SPACE,

8mils DIELECTRIC HEIGHT

TRACE LENGTHS = 20 INCHES,

30 INCHES

25ps/DIV

REFERENCE EYE DIAGRAM AT TP1

Figure 12. Output Preemphasis Test Circuit

25ps/DIV

Figure 13. 6.5 Gbps Output Eye, 20 Inch FR4 Input Channel, PE = 0

(TP3 from Figure 12)

25ps/DIV

Figure 14. 6.5 Gbps Output Eye, 30 Inch FR4 Input Channel, PE = 0

(TP3 from Figure 12)

25ps/DIV

Figure 15. 6.5 Gbps Output Eye, 20 Inch FR4 Input Channel, PE = Best Setting,

Default Output Level (TP3 from Figure 12)

25ps/DIV

Figure 16. 6.5 Gbps Output Eye, 30 Inch FR4 Input Channel, PE = Best Setting,

200 mV Output Level (TP3 from Figure 12)

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