PCB crosstalk causes and solutions

PCB crosstalk causes and solutions

PCB (printed circuit board) is a very important part of electronic products, it connects various electronic components, and provides electrical connections and mechanical support. Crosstalk is a common problem during PCB design and manufacturing, and it can negatively affect circuit performance. This article will detail the causes of PCB crosstalk and provide some solutions.

1. Causes of crosstalk

1. Electromagnetic Interference (EMI)

Electronic devices generate electromagnetic radiation during the working process, and changes in current and voltage on the signal line will generate magnetic fields, resulting in changes in charges and currents on nearby lines, resulting in crosstalk. Electromagnetic interference mainly comes from high frequency signal, ground reflux and power reflux.

2. Signal Integrity (SI)

Signal integrity refers to the ability of a signal to maintain stability and accuracy as it travels through a circuit. When the signal is transmitted in the PCB, it is affected by factors such as impedance mismatch, signal coupling and backflow, which can cause signal deformation and crosstalk.

3. Power supply noise

Power supply noise refers to changes in voltage and current caused by power supply voltage fluctuations, power line impedance mismatches, and other electrical factors. Power supply noise can be coupled to other lines through the power cord, causing crosstalk.