A Cost-Effective Embedded Platform for Scalable Multichannel Biopotential Acquisition

The design of a compact and cost-effective system for acquisition and processing of high-count biopotential sensor arrays is an open challenge, which could, if addressed, significantly push forward the State-of-the-Art (SoA) wearable applications. Nowadays, the form factor of commercial devices for large-array acquisition does not match size constraints of a wearable setup and most systems rely on high-cost chips, typically with a cost per channel higher than 10 USD. In this work, we present a scalable multichannel platform for biopotential acquisition, which breaks the barrier of 1 USD per channel, and can acquire 32 channels with an input-referred noise of 0.75 μVRMS in the [0.5–100] Hz band and 1.15 μVRMS in the [20–250] Hz band and with 24-bit resolution, which is still suitable for most biomedical and rehabilitation applications.