Performance Analysis of Charge Sensitive Amplifier

In this paper, we have analyzed the performance of a front-end design of a read out integrated circuit (ROIC) which is based on capacitive sensing method. Operating read of capacitive sensor-based circuits consists of a Charge-Sensitive Amplifier (CSA) with a reset network. These ROICs can be used in wide variety of semiconductor applications, including the Internet of Things (IoT) and mobile devices. The improvement in the micro electro mechanical system (MEMS) processes allow capacitive sensors to be integrated into silicon integrated circuits, while the readout circuit electronics may be implemented using different technologies. In this paper, CSA design have been simulated using a standard 180nm CMOS technology. The simulation result shows a noise and transient analysis of the circuit. A comparative study of the performance has been done for variable frequencies which shows that for a fixed capacitance value (1 picofarad and 1 femtofarad) output voltage and power consumption increases with frequency upto 500KHz whereas noise level gets reduced.