Before designing multilayer PCB, designers need to first according to the size of the circuit, the size of the circuit board, and the requirements of electromagnetic compatibility (EMC) to determine the structure of circuit board, which is decided to adopt 4 layer and 6 layer, or the number of multilayer circuit board. Determine the layer, and then determine how electricity layer and placed within different signal on the layer distribution. This is the problem of multi-layer PCB cascade structure choice. Cascade structure is an important factor affecting PCB EMC performance, is also an important means to restrain electromagnetic interference.
The number of layers and superposition principle
Determine the cascade structure of multilayer PCB need to consider more factors. In wiring ways, layer number of the more the wiring, but plate cost and difficulty also increases. For manufacturers, cascade structure symmetry or not is the focus of the need to pay attention to when PCB manufacturing, so the layer number of choice need to consider all aspects of the demand, in order to achieve the best balance.
For experienced designers, after fulfilling the components of the preliminary layout, bottlenecks for PCB wiring place emphasis on analysis. Combined with other EDA tools to analyze circuit board wiring density; Then integrated signal such as difference lines with special wiring requirements, such as sensitive signal lines to the number and variety of determine the signal of the layer number; Then according to the requirement of the power supply, isolation, and the kinds of anti-interference to determine the number of electric layer within. In this way, the whole circuit board layer number is basic assurance.
Ms Grace Zhang
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Oversea sales
Oversea sales
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