Theoretical Model of A Three Plates Capacitive Pressure Sensor

Abstract

In the design of micro pressure sensors, the deflections of diaphragms are crucial to conduct performance simulations. This paper discuss two cases of diaphragm deformation in a three plates capacitive pressure sensor: a clamped edge diaphragm under uniform load and a cantilever plate deflects in touch mode operation. Analytical models are proposed to provide a quick estimation of the sensors. Evaluation of these models have been done by comparing the results to that of the finite-element method (FEM).