Interface Circuit Design for MEMS Based Piezoresistive Accelerometer

Abstract

This project presents an interface circuit designed for MEMS based piezoresistive accelerometer in standard 0.35u CMOS technology. Piezoresistive accelerometer is a sensor for g-force which represents acceleration standardized in terms of g = 9.8 m/s2. To read the output an interface circuit is required which consist of various CMOS circuits i.e. ADC, sample and hold, shift register, comparator. In this project 10 – bit cyclic ADC components are designed and verified using Verilog-A. The results obtained through schematic confirm to the results obtained through verilog-A.

Conclusion MEMS based Piezoresistive accelerometer has been studied. Interfacing circuit for the same requires an ADC.Verilog-A description of various components (Sample and hold, subtractar/multiplier, comparator, shift resister) was defined, simulation of which was found to be in accordance with the schematic design of these circuits.10- bit shift register designed has very fast simulation time as compare to the traditional circuit.

FUTURE WORK

Verilog-A description of the 10 – bit cyclic adc and comparing its result with the schematic for the same. The work would be to ensure that both the simulation results are matched.