Design of a PPG Signal Acquisition Platform Robust to Ambient Light

The paper presents a design for a PPG signal acquisition platform, proficient in reducing ambient light interference. It investigates and models the PPG signal’s characteristics using the Beer-Lambert theory. The structured design consists of three vital stages: a transimpedance amplifier, an ambient light sampler, and a unit combining a low-pass filter with a subtractor. After conducting thorough simulations with the emulated PPG signal to confirm the design’s efficacy, components for each stage were meticulously selected, culminating in a specialized board design. The research emphasizes the development of a reliable PPG acquisition platform, enabling precise computation of biological parameters, even amidst ambient light disruptions. Its significance lies in refining computational methods for biological parameters of interest derived from photoplethysmogram (PPG) signals. As ambient light interference is known to induce inaccuracies in the quantification of these parameters, the study aims to mitigate such errors.