Measurement Investigation of MLCC Mounting Variation Impact on Acoustic Noise in Power Distribution Network

The multilayer ceramic capacitors (MLCCs) mounting method impact on the MLCC induced acoustic noise in printed circuit board (PCB) is investigated through measurement. The influence of MLCC soldering stencil height, MLCC orientation and MLCC pair offset distance are evaluated on a series of test boards. The sound pressure level (SPL) is measured to evaluate the PCB acoustic noise performance. In the investigated mounting variation range, the acoustic noise performance does not exhibit noticeable changes.