Protel DXP is the first board level design system that integrates all design tools. From the initial project module planning to the final production data, electronic designers can implement it in their own way. Protel DXP runs on the optimized design browser platform, and has all the advanced design features of today. It can handle all kinds of complex PCB board design process. Through the integration of input simulation, PCB board editing, topological automatic routing, signal integrity analysis and design output, Protel DXP provides a comprehensive design solution.
The principles of PCB design include the following aspects:
1. Selection of PCB
2. PCB size
3. PCB component layout
4. PCB wiring
5. PCB grounding
6. PCB anti-interference
7. PCB pad
8. Large area filling of PCB
9. PCB jumper
10. PCB high frequency wiring
(一）Selection of PCB
PCB boards are usually made of copper clad laminate. The choice of laminate should be considered in terms of electrical performance, reliability, processing requirements and economic indicators. The commonly used copper laminates are copper coated phenolic paper laminates, copper coated epoxy paper laminates, copper coated epoxy glass cloth laminate, copper coated epoxy phenolic glass cloth laminate, copper coated polytetrafluoroethylene glass cloth laminate and epoxy glass cloth for multilayer printed circuit boards. Laminates with different materials have different characteristics. Epoxy resin has excellent adhesion with copper foil, so the adhesion strength and working temperature of copper foil are high, and it can not bubble in molten tin at 260 ℃. The glass cloth laminate soaked by epoxy resin is less affected by moisture. UHF circuit boards are preferably copper coated polytetrafluoroethylene glass cloth laminate. In the electronic equipment requiring flame-retardant, flame-retardant PCB boards are also needed, which are all laminates immersed in flame-retardant resin.
