Loss problems caused by crosstalk in high-speed circuits
by Jiang Xiuguo signal integrity
Translated by Hualink RF Sunny Li
As signal rates increase and miniaturization becomes more prevalent, reducing crosstalk becomes more difficult.
It is well known that crosstalk is related to many factors, such as the distance between transmission lines, the length of transmission line coupling, the rise time of attack signal, impedance discontinuity and so on.
Because crosstalk is a complex problem, it can affect the integrity of other signals if not solved properly.
Today I would like to share with you a problem caused by crosstalk loss.
This type of problem often occurs in miniaturized products, connectors, cables, and other products.
Firstly, a simulation circuit is built in the ADS schematic diagram, and the scanning simulation spacing is 11mil and 60mil.
Check the result of insertion loss after running the simulation:
Disable R1 and R2 on the circuit diagram:
Simulation is shown in the figure below:
From the analysis of the results, after removing the resistance, when the distance is 60mil, the results are almost unchanged, but when the distance is 11mil, the results are completely inconsistent, resulting in three very large resonance points.
This is enough to cause the product to fail to meet the design requirements.
From the above simulation results, we can see that there are two convenient and common ways to solve this problem, namely, extending the distance or doing a good connection.
