An ultralow power PPG sensor using a heartbeat locked loop consumed only 43.4 μW at 60 b/m with a heart rate error of less than 2.1 b/m for rates below 180 b/m.
The proposed heartbeat locked loop PPG sensor achieves state-of-the-art ultralow power consumption while maintaining high accuracy for heart rate monitoring.
In this paper, we present an ultralow power heart rate (HR) monitoring photoplethysmography (PPG) sensor using a heartbeat locked loop (HBLL). The HBLL generates a narrow window that turns on the LED and analog-front-end only when a peak is expected in the PPG signal. The prototype PPG sensor implemented in 0.18 μm CMOS has an effective duty-cycle of 0.01% and consumes only 43.4 μW at a HR of 60 b/m, which is the lowest power consumption compared with previous state-of-the-art PPG sensors. The HR error of the proposed sensor is less than 2.1 b/m for HR below 180 b/m.
Lee et al. (Thu,) reported a other. Photoplethysmography (PPG) sensor using a heartbeat locked loop (HBLL) vs. Previous state-of-the-art PPG sensors was evaluated on Power consumption and heart rate error. An ultralow power PPG sensor using a heartbeat locked loop consumed only 43.4 μW at 60 b/m with a heart rate error of less than 2.1 b/m for rates below 180 b/m.