帶狀線的串擾
PCB Stripline Crosstalk Calculator
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Stripline Crosstalk Calculator
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Introduction
Crosstalk is unwanted coupled energy between traces. There are two types of crosstalk: forward and backward. This tool calculates backward crosstalk which is usually the dominant crosstalk component.
Description
Backwards crosstalk creates a pulse width that is twice that of the propagation time of the pulse traveling the coupling distance. The amplitude of this crosstalk is what this tool calculates. The amplitude increases as the coupling length increases up to a point. At some point the amplitude will stay constant. The crosstalk coupling calculation requires information for the driver source as well as the PCB physical characteristics. This tool calculates the crosstalk coefficient as well as the coupled voltage, both can be useful in crosstalk analysis.
Stripline Transmission Line Crosstalk Models
The following models approximate the forward crosstalk in stripline transmission lines.
T_{RT} = 1.017\sqrt{\varepsilon _{r\cdot 0.475+0.67}}\cdot L\cdot 2
S_{eff}=\sqrt{S^{2}+\left (h_{2}-h_{1} \right )^{2}}
h_{1eff}=\frac{h_{1}\cdot \left ( H-h_{1} \right )}{h_{1}+ \left ( H- h_{1} \right )}
h_{2eff}=\frac{h_{2}\cdot \left ( H-h_{2} \right )}{h_{2}+ \left ( H- h_{2} \right )}
if
\frac{T_{RT}}{T_{R}}\leq 1
then
CT_{dB} = 20\log \left ( \frac{1}{1+\left ( \frac{ S_{eff}^{2}}{h_{1eff}\cdot h_{2eff} } \right )}\cdot \frac{T_{RT}}{T_{R}} \right )
V_{crosstalk} = V\cdot \frac{1}{1+\left ( \frac{S_{eff}^{2}}{h_{1eff}\cdot h_{2eff} } \right )}\cdot \frac{T_{RT}}{T_{R}}
else
CT_{dB} = 20\log \left ( \frac{1}{1+\left ( \frac{ S_{eff}^{2}}{ h_{1eff}\cdot h_{2eff}} \right )^{2}}\right )
V_{crosstalk} = V\cdot \frac{1}{1+\left ( \frac{ S_{eff}^{2}}{ h_{1eff}\cdot h_{2eff}} \right )^{2}}