After completing the pre-layout, the PCB design engineer needs to analyze the board's wiring bottleneck, and then combine the PCB design software to determine the number of wiring layers, the performance requirements and cost tolerance of the integrated board, and determine the power supply of the board. The number of layers in the ground and their relative arrangement with the signal layer. This section mainly introduces the PCB stack design method: PCB design software CrossSecTIon interface, the basic principles of PCB stack design. First, the CrossSecTIon interface introduction Allegro provides an integrated, convenient, and powerful tool for stack design and impedance calculation control called Cross SecTIon. As shown in the figure below, material selection, parameter determination, and final impedance results can be made very intuitively. The meaning of each option: 1.Type: Select the type of each layer: conductance, medium, plane 2.Material: Material, commonly used as FR-4 3.Thickness: the thickness of each layer 4.ConducTIvity: Conductivity 5.Dielectric Constant: Dielectric constant 6.LossTangent: loss angle 7.NegativeArtwork 8.Shield: reference plane Tabbing Ribbon Machine,Photovoltaic Ribbon Welding Machine,Pv Ribbon Interconnect Machine,Ribbon High Speed Tinning Making Machine Jiangsu Lanhui Intelligent Equipment Technology Co., Ltd , https://www.lanhuisolar.com