Title
In-sensor time-domain classifiers using pseudo sigmoid activation functions
Abstract
This work presents an ultra-low-power classifier that can be integrated within energy-constrained bio-sensors to enable rapid analysis for continuous health monitoring. The in-sensor classifier saves significant transmission energy by extracting critical information locally to eliminate the need of transmitting raw data to centralized servers for remote signal processing. The convolutional-neural-network (CNN)-based classifier is built by using reconfigurable delay-locked loops (DLLs) to carry out classification algorithms with time-domain multiply-accumulate (MAC) operations. Pseudo sigmoid activation functions are realized by regenerative comparators that transform weighted timing to probabilities. The presented classifier achieves low-power consumption of 240.34 nW while performing up to 20 k operations per second. The proposed time-domain classifier reduces the energy to 36% of the previous works.
Year
DOI
Venue
2020
10.1016/j.vlsi.2020.03.002
Integration
Keywords
DocType
Volume
Classifier,Machine learning,Smart sensors,Time-domain,Inner-products
Journal
73
ISSN
Citations 
PageRank 
0167-9260
0
0.34
References 
Authors
0
2
Name
Order
Citations
PageRank
Ethan Chen100.34
Chen, V.H.-C.252.66