Non-uniform dielectric layer capacitor for vibration and acoustics improvement

摘要

A Non-Uniform Dielectric Layer, Multi-Layer-Ceramic-Capacitor (MLCC) has upper and lower dielectric layers separating upper and lower electrode layers, where the lower dielectric layers have a greater vertical thickness than the upper dielectric layers to reduce piezoelectric effect driven capacitor reaction forces on a printed circuit board (PCB) on which the capacitor is mounted. Such an MLCC may include an upper set of dielectric layers that separate adjacent pairs of upper electrode layers in a top portion of the MLCC, and a lower set of dielectric layers that separate adjacent pairs of lower electrode layers in a bottom portion of the MLCC. A bottom portion of the MLCC may be mounted on a PCB. The thickness of the lower dielectric layers may be between 1.5 and 3.5 times greater than the upper dielectric layers to reduce piezoelectric effect driven capacitor reaction forces in the audio range of human hearing.

主权项

1. A Multi-Layer-Ceramic-Capacitor (MLCC), comprising:
a first plurality of electrode layers in a top portion of the MLCC, a first set of the first plurality of electrode layers directly connected to a first terminal of the MLCC, and a second set of the first plurality of electrode layers directly connected to a second terminal of the MLCC; a first plurality of dielectric layers separating the first plurality of electrode layers, wherein the first plurality of dielectric layers have a first vertical thickness between adjacent ones of the first plurality of electrode layers; a second plurality of electrode layers in a bottom portion of the capacitor, a first set of the second plurality of electrode layers directly connected to the first terminal, and a second set of the second plurality of electrode layers directly connected to the second terminal; a second plurality of dielectric layers separating the second plurality of electrode layers, wherein the second plurality of dielectric layers have a second vertical thickness between adjacent ones of the second plurality of electrode layers; wherein the second vertical thickness is greater than the first vertical thickness.