CMOS integrated circuit design for the acquisition of biopotential signals

Abstract

The project examines the design and implementation of a Biomedical potential acquisition system. The area of study in such devices is relatively new and is still in the incline as devices are still being manufactured and introduced on the market. The presented design is a low-power, low-noise analogue Biopotential signal acquisition system. The final design draws only 99.45 W from a 2 V supply, making it appropriate for battery operation and portability. The technology presented in this design is a standard 0.35 m CMOS technology utilising of current feedback techniques and achieving a CMRR of 124 dB while total input noise referred noise is as low as 7.13 V rms. The main goal of the proposed design was to be as low power consuming as possible, subject to constraints imposed by the technology itself. The design consists of three main building blocks, the first and main block being the Instrumentation Amplifier (IA) allowing the amplification and filtering of signals, second being an analogue multiplexer which allows the circuit to process multiple signals. The last building block is the Programmable Gain amplifier, which allows the end user to set the amplification gain according to the type biomedical signal acquisition desired.