A 20.1-μW 1.8-GHz Near-Field Dielectric Plethysmography (NF-DPG) Heart-Rate Sensor with Time-based Edge Sampling
Journal
Proceedings of the Custom Integrated Circuits Conference
Journal Volume
2019-April
Date Issued
2019
Author(s)
簡俊超
Abstract
This paper presents a near-field dielectric plethysmography (NF-DPG) heart-rate sensor for low-power operation. By interrogating the contracting and expanding blood vessels with GHz-frequency fringing electric fields from the on-board coplanar electrodes, pulsing heart-rate signals are detected through changing permittivity at the fingertips. The sensor employs large-signal time-based edge sampling and double-integration chopper stabilization technique to maximize the sensitivity and to minimize the flicker noise. Implemented in 0.18-μm CMOS technology, the NF-DPG heart-rate sensor consumes 20.1 μW at a 100-Hz sampling rate while achieving an RMS inaccuracy of 1.64 bpm.
SDGs
Type
conference paper