A method of automatic placement that reduces electromagnetic radiation noise from digital printed circuit boards

An algorithm for automatic component placement that reduces electromagnetic (EM) noise from digital printed circuit boards is presented. First, the components are divided into groups by using a rule-based expert system along with a circuit's netlist and parts list. Then, the grouped components are placed by using a novel placement algorithm called "EMI balance placement." Finally, components that have a net length restriction are placed. To show the validity of the algorithm, the layout result of the proposed method for the main board of a multimedia equipment is compared with that of the conventional method.