System Support for HET Testbed and Optical Methods for Biosensing Team

Statement of Project Goals: 1. Design and assemble the Generation 0 (Gen 0) Health and Environmental Tracker (HET) testbed device to provide a baseline measurement platform to benchmark the improvements in Generation 1 (Gen 1) system in terms of power consumption, signal to noise ratio, sensor performance and size. The HET testbed includes a wristband and a chest patch. Obtain IRB approval and perform tests on 10 human subjects with Gen 0 and Gen 1 system to compare the performances of two devices and explore the challenges with practicality and wearability of these systems. 2. Design and tape-out a low power analog front-end circuit for ECG and pulse oximetry measurement to be coupled to the ASSIST System-on-chip on the HET testbed. The aim of this effort is to provide a high dynamic range and low power operation by using chopper-amplifiers and Gm-C filters for ECG amplifiers and logarithmic amplifiers for pulse oximetry recording. The overall power consumption for ECG amplifier is to be less than 50μW and for the pulse oximeter system less than 1mW. 3. Use double-junction photodiodes to register multiple wavelengths simultaneously and separately for the pulse oximetry system. The aim of this effort is to avoid extra circuit elements used for wavelength switching at the input (light source) and sampleand-hold at the output stages to lower the power consumption.