Patent ID: 9290374
Filing Date: 2016-03-22
CPC Classification: B81B

Claim Text:
1. A micro-electro-mechanical system (MEMS) device having differential capacitors of corresponding sizes, comprising: a substrate; a top fixed electrode; a bottom fixed electrode; a mass, including a top electrode which forms a top capacitor with the top fixed electrode and a bottom electrode which forms a bottom capacitor with the bottom fixed electrode; a top fixed electrode extension wall having an upper end connected to the top fixed electrode and a lower end connected to the substrate; and a bottom fixed electrode extension wall having a lower end connected to the substrate through the bottom electrode, wherein the bottom fixed electrode extension wall is not connected to the top fixed electrode at any upper end of the bottom fixed electrode extension wall, and a total of a conductive surface area of the top fixed electrode extension wall facing the mass and a conductive surface area of the top fixed electrode facing the mass is substantially equal to a total of a conductive surface area of the bottom fixed electrode extension wall facing the mass and a conductive surface area of the bottom fixed electrode facing the mass.