Flexible Analog Front End Architecture for Biomedical Applications

The advances in emerging technologies expanded the healthcare with a paradigm shift in treatment options. There is a growing need of wireless health-monitoring systems that uses portable and wearable low power devices for sensing biopotential signals. In this paper, a work is proposed to reduce analog front end circuit complexity of biosignal acquisition system using sigma-delta modulator architecture. It consists of single-loop, second-order continuous time cascaded integrator feed forward topology. The MATLAB simulation result shows that Signal-to-Noise ratio is 106.7dB, Effective number of bits is 17 and Dynamic Range of 102dB.