Paper Info
Title
A 1.8-GHz Near-Field Dielectric Plethysmography Heart-Rate Sensor With Time-Based Edge Sampling
Abstract
This article presents a near-field dielectric plethysmography (DPG) heart-rate sensor for low-power operation. By interrogating the contracting and expanding blood vessels with gigahertz-frequency fringing electric fields from the on-board coplanar waveguide (CPW) transmission line, pulsing heart-rate signals are detected using a phase-sensitive interface circuit through changing permittivity at the fingertip. Signal analysis, frequency response measurements, and variability studies are provided to demonstrate the robustness of DPG for heart-rate detection. The readout circuit employs a highly digital time-based edge sampling with the rail-to-rail signaling and double-integration chopper stabilization technique to maximize the electronics sensitivity and to minimize the flicker noise. Implemented in the 0.18- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> CMOS technology, the phase-sensitive readout circuit exhibits a limit of detection of 0.0033° and consumes 20.1 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{W}$ </tex-math></inline-formula> under a sampling and duty-cycling rate of 100 Hz and 0.0256%, respectively. With the integration of CPW sensor in a low-cost FR-4 printed-circuit board (PCB), the 1.8-GHz DPG heart-rate sensor achieves an rms inaccuracy of 1.64 bpm.
Year
DOI
Venue
2020
10.1109/JSSC.2019.2951691
IEEE Journal of Solid-State Circuits
Keywords
Field
DocType
Frequency measurement,Permittivity measurement,Permittivity,Sensors,Dielectrics,Monitoring
Computer science,Dielectric,Near and far field,Electronic engineering,Sampling (statistics),Heart rate,Acoustics,Plethysmograph
Journal
Volume
Issue
ISSN
55
3
0018-9200
Citations 
PageRank 
References 
0
0.34
0
Authors
1
Name
Order
Citations
PageRank
Jun-Chau Chien113019.66