In electronic product design, PCB layout is the most important step, PCB layout is good or bad will directly affect the performance of the circuit. Now, although there are a lot of software can realize automatic PCB layout, but with ever increasing signal frequency, most of the time, engineers need to know about the PCB layout of the basic principles and skills, such ability can let oneself of perfect design, the layout of PCB (printed circuit board) wiring 100 q "covers the basic principle and relevant PCB layout design skills, in the form of questions and answers to solve the problems about PCB layout, which includes the current popular high frequency design problem, is very rare for PCB design personnel practical reading. ......