Proper design of grounding for SMPS converters

Converters that are used in a switching mode power supply (SMPS) are usually well designed internally so as to maximize efficiency and minimize output noise. However, deficiencies in the distribution of power and grounding within the PCB where the SMPS converters will be located can negate many of the advantages provided by these converters. It is shown that inductive and capacitive effects in the way SMPS converters are used in a PCB are one of the major causes of high conductive emission in PCBs. Furthermore, it is shown that changes in grounding layouts can affect these inductive and capacitive effects