The analysis of the self-oscillation system for resonant pressure sensor

In this paper a detailed analysis on the self-oscillation system that is used for the resonant pressure sensor is presented. The stability and transient response of the system are investigated through a theoretical model, which is verified by experiment. This analysis provides an approach to optimize the parameters of the control system to get a short settling time and a stable system in the full pressure scale. The sensor chip is fabricated using a commercially available silicon-on-insulator wafer. By optimizing the parameters, the self-oscillation system for the sensor works well and the setting time is less than 300 ms in full pressure scale. The calibration result shows that the resonant pressure sensor has a nonlinearity of 0.045 %FS, a hysteresis error of 0.14 %FS, and a repeatability error of 0.18 %FS.