A Configurable Integrated Circuit for Biomedical Signal Acquisition

Abstract

A 10 channel CMOS integrated circuit (IC) for biomedical signal acquisition is presented. Each channel of the IC includes a programmable analog front-end (AFE) and a 20 bit analog-to-digital converter (ADC). An active DC-suppression circuitry allows to tolerate DC-offsets of up to ±1 V for a power supply voltage of 3.3 V. The AFE includes a common-mode rejection ratio (CMRR) calibration circuitry resulting in a CMRR of more than 80 dB. In low-noise mode the AFE achieves an input referred noise of less than 0.11 μV rms for EEG application (0.5-70 Hz) and the power consumption of the IC is less than 30 mW in low-power mode. An experimental USB-Stick for biomedical signal acquisition has been realized using the IC. © Springer-Verlag Berlin Heidelberg 2013.