source:Industry News release time:2023-07-18 Article author:yu Popular:pcb
With the emergence of high-speed circuits, the complexity of PCB boards is also increasing. In order to avoid electrical interference, the signal layer and power layer must be separated, which involves the design of multi-layer PCBs. So, what should be paid attention to when setting the power and signal layers of PCB multilayer boards?
1. Settings for power and grounding
. The correct design of power supply and grounding is crucial for suppressing electromagnetic interference. The power cord and ground wire should be as wide as possible to reduce resistance; Digital circuits and analog circuits should be grounded separately; The ground of digital circuits can form a closed loop to improve noise resistance performance. If the number of circuit board layers allows, the power layer and ground layer can be set, or a larger power or ground area can be obtained by dividing the power supply and ground.
2. Both the power supply and the ground plane can be used as the Plane of reference, and have a certain shielding effect. From the perspective of shielding, the ground plane is generally grounded and serves as the basic level reference point, which has a much better shielding effect than the power plane.
3. The relative position between the power layer, stratum, and signal layer. After determining the number of layers of power and ground, as well as the number of signal layers, the relative layout between them is an issue that every EMC engineer cannot avoid. Layout principle: the second layer below the element surface is the ground plane, which provides the device shielding layer and Plane of reference for the top layer wiring; All signal layers should be adjacent to the ground plane as much as possible; Try to avoid two signal layers directly adjacent.
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