Patent ID: 8263426
Filing Date: 2012-09-11
Classification: G01H,G01P,H04R

Abstract:
1. A method of fabricating a high-sensitivity MEMS-type z-axis vibration sensor, comprising: providing a silicon on insulator (SOI) substrate comprising an upper silicon layer disposed over a thermal oxide layer, and a silicon wafer disposed under the thermal oxide layer; doping the upper silicon layer with impurities to form a lower electrode; forming a silicon dummy ring in the doped upper silicon layer to define a center mass region of the doped upper silicon layer; forming a second upper oxide layer to a predetermined thickness and a polysilicon layer over the doped upper silicon layer; doping the polysilicon layer with impurities to form a center ground electrode; forming a sacrificial oxide layer and an upper electrode over the doped polysilicon layer; etching a lower surface of the silicon wafer to isolate the center mass region of the doped upper silicon layer; and etching the sacrificial oxide layer and the second upper oxide layer through an upper surface of the upper electrode, and forming a vibration space in which the doped polysilicon layer is capable of vibrating in a z-axis direction.