Stability Analysis of Transimpedance Amplifier for Capacitive Sensor Applications
Bhanu Joshi, T. P. Mahajan, Damayanti Gharpure · Soft Computing Research Society eBooks · 2021
The aim of this study is to analyze transimpedance amplifier with a feedback network (TIA-Fn) for measuring unknown capacitance value. Mathematical analysis along with electronic circuit simulation results are presented. The selection criterion of feedback components (Cf and Rf) is discussed. The circuit is capable of measuring unknown capacitance in the range of 1pF to 10pF which is useful in many applications such as thickness measurement, Electrical Capacitance Tomography, Moisture measurement to name a few. Frequency domain analysis has been carried out forgain and stability parameters of the proposed circuit with AD LT spice simulation software. While simulating, non-ideal components are taken in to consideration. Mathematical and simulation results are mutually related. The designed amplifiers suitable for connecting the unknown capacitance terminal with AC excitation.