Research on EMC optimization of high speed PCB design

In This paper three optimization methods of ground design are used to solve EMI problems on the PCB mixed with both analog and digital signals. A model was built to test the surface current, E field, H field and S-parameters of the circuit board to consider the effect of these methods of avoiding EMI and SI problems. Then simulation experiments on a real product are carried out to show the improved performances after adopting these methods.