A design of spring constant arranged for MEMS accelerometer by multi-layer metal technology

Abstract

We report an approach to design spring constant arranged for MEMS accelerometers fabricated by multi-layer metal technology. The proposed multi-layer metal structure can control the spring constant of serpentine flexure to suspend high-density proof mass. Moreover, the multi-layer metal configuration enables us to obtain high degree of freedom of spring constant design without compromising the performance of the MEMS accelerometer. A proof-of-concept device has been fabricated, and the measured characteristics of the proposed micromechanical springs were consistent with the design values.