How can industrial servo high-frequency devices be kept away from sensitive circuits?

High-frequency components in servo systems (such as switching power supply ICs, clock crystals, and IGBT drivers) are the main noise sources and must be kept away from sensitive circuits (such as analog sampling, encoder interfaces, and communication chips). Audiotech's layout strategy: During the initial PCB layout, circuit modules are zoned according to noise intensity based on the schematic. High-frequency noise sources are concentrated on one side or corner of the board, while sensitive circuits are placed at the farthest point diagonally, with digital or power circuits used as buffers in between. The actual distance should be at least 5cm. For on-board switching power supply modules, a metal shield can be used for isolation, with the shield properly grounded through multiple vias. In three-dimensional space, overlap between high-frequency components and sensitive circuits in the vertical direction should be avoided. Through this layout, combined with the use of CMZ common-mode inductors and PBZ ferrite beads for local filtering, the coupling of high-frequency noise to sensitive circuits can be attenuated by more than 30dB, significantly improving the system's anti-interference capability in harsh industrial environments.