基于网分的
TDR测试测量技术
1
2/1/2024
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What Is Signal Integrity?
driver
receiver
Series termination (~40 Ohms)
3” PCB Trace
Signal Integrity =
Where the electrical properties of the interconnects can
cause significant distortions in digital signals.
• >1 GHz of bandwidth
• <1 ns risetime
• Typically >2 Gb/s data rate with embedded clock
Signal Integrity = Paying attention to RF effects, ie. impedance
3” PCB Trace
driver
2
Page
The Reality Is That FR4 Limits Your Options
–FR4 is common, low cost and
easy to manufacture
–BUT it has problems:
• Reflections at high speeds
• Dispersion varies with frequency
• High Insertion Loss
• ISI induced Jitter
• Effects vary with temperature and
humidity
What Works
Today
Gets Worse
The Next
Time
Then
Stops
3.125 Gb/s
6.25 Gb/s
12.5 Gb/s
3
Page
基于网分TDR
vs
基于采样示波器的TDR
Keysight Restricted 4
2/1/2024
Page
第一次测量
(f=起始频率)
第二次测量
(f=起始频率+ΔF)
…
第 n 次测量
(f=终止频率)
…
t
t
t
DUT
DUT
矢量网络分析仪进行测量的过程
DUT
在不同的频率点上反复重复同样的测试，测试频率逐渐提高（频率扫描）
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5
2024/2/1
ENA
-C TDR
