A DSP-Based EBI, ECG, and PPG Measurement Platform

Anar Abdullayev, Marek Rist, Olev Märtens, Margus Metshein, Benoit Larras, Antoine Frappé, Antoine Gautier, Mart Min, Deepu John, Barry Cardiff, Andrei Krivosei, Paul Annus

Abstract: A test and evaluation platform has been developed to research and develop solutions and algorithms for joint acquisition, processing, and reasoning from the electrical bioimpedance (EBI), electro-cardiography (ECG), and photoplethysmography (PPG) signals. The solution is based on the low-cost Launchpad of the Texas Instrument TMS320F28379D dual core 16/32-bit digital signal processor (DSP) with 16-bit multichannel analog-to-digital converter (ADC) and several other peripherals (pulse-width modulation (PWM), ADC, timers, I2C, serial peripheral interface (SPI), a lot of static random-access memory (SRAM) and flash memory). In the simplest mode, the platform is used to simultaneously acquire the EBI, ECG, and PPG signals at 1 kHz and send them to the PC by virtual COMport, for further analysis and presentation. The EBI, ECG, and PPG signals are sampled with a 16-bit ADC and have a resolution of more than four decimal digits, with an EBI error of less than 0.002%. In the next stage, various embedded and “at the edge” measurement algorithms will be developed, tested, demonstrated, and evaluated on this platform.