Design and simulation of readout circuit for mems sensor

Abstract

Output from any MEMS Sensor usually lacks the power that can be fed directly to any interface circuit. Hence there is a need to add additional circuitry in between the output of the MEMS sensor and the interface circuit. In this paper the authors have compared two combinations of modulator / demodulator circuitry which can be used in the readout circuitry for any MEMS sensors. The two combinations are Gilbert multiplier as modulator and demodulator and the second one is Gilbert Multiplier as Modulator and Chopper circuit as demodulator. A detailed analysis of the two combinations is presented in the paper. The simulations were carried out using gpdk 350nm technology file in Cadence tool. The layout has been generated for each block and DRC and back annotation has been done to note overall circuit delay as 118ns.