LI Chuang, ZHAO Libo, ZHANG Lei, et al. Optimal design and fabrication of E-type structural MEMS SOI pressure sensor chip[J]. 2020, (4): 73-76. DOI: 10.13873/J.1000-9787(2020)04-0073-04.
A MEMS piezoresistive pressure sensor chip with E-type structural membrane based on silicon on insulator( SOI) substrate material is designed. Compared with traditional C-type
E-type structural membrane resolves the contradiction between the sensitivity and linearity that both of them are difficult to improve synchronously. Through the sensitive membrane structure design
the key dimensions calculation and the finite element analysis
the structure of the sensitive membrane is optimized. The sensor chip with the proposed structural membrane is fabricated by the MEMS technology and film-insulated-oil-filled process. The experiments show that the proposed sensor achieves sensitivity of 15. 1 m V/V and nonlinearity error of 0. 2 % FS in the range of 0~ 1 MPa.