A Study on the Reduction Method of the Magnetic Field Radiated from PCB Including Multi-Loops (n=2)

The near magnetic field radiated from a printed circuit board (PCB) including two multi-loops is studied in this paper. It is found that the magnetic field radiated from the PCB can be reduced by means of the parts layout making the current direction flowing through Vcc-GND pins of the adjacent IC to be opposite, based on the following phenomena of (1) and (2). (1) The total amounts of near magnetic field cannot always be obtained from addition of each near magnetic field from a single sub-circuit. (2) Digital IC can be characterized by the current model flowing from Vcc pin to GND pin.