A bulk-micromachined comb accelerometer with floating interconnects

In this paper, a silicon-on-glass bulk-micromachined comb accelerometer with floating interconnect is introduced. The device uses unique floating back interconnect for the connection of the fixed comb fingers, which leads to more compact design. Based upon the analysis of the device behavior, an optimized device design is proposed. Simulation results show that the device has a static capacitance of 2.8pF and sensitivity of 17.9nm/g. The fabrication sequence of the accelerometer is discussed. The floating interconnection technique may be applied to other bulk-micromachined MEMS devices for 3D interconnection