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

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.