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Passive Extraction of Signal Feature Using a Rectifier with a Mechanically Switched Inductor for Low Power Acoustic Event Detection
Open AccessArticle

Low-Power Sensor Interface with a Switched Inductor Frequency Selective Envelope Detector

Faculty of Electrical Engineering and Computing, University of Zagreb, 10000 Zagreb, Croatia
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Author to whom correspondence should be addressed.
Academic Editor: Fabian Khateb
Sensors 2021, 21(6), 2124; https://doi.org/10.3390/s21062124
Received: 17 February 2021 / Revised: 12 March 2021 / Accepted: 16 March 2021 / Published: 18 March 2021
(This article belongs to the Special Issue Low Power and Energy Efficient Sensing Applications)
With the growing need to understand our surroundings and improved means of sensor manufacturing, the concept of Internet of Things (IoT) is becoming more interesting. To enable continuous monitoring and event detection by IoT, the development of low power sensors and interfaces is required. In this work we present a novel, switched inductor based acoustic sensor interface featuring a bandpass filter and envelope detector, perform a sensitivity, frequency selectivity, and power consumption analysis of the circuit, and present its design parameters and their qualitative influence on circuit characteristics. We develop a prototype and present experimental characterization of the interface and its operation with input signals up to 20 mV peak-to-peak, at low acoustic frequencies from 100 Hz to 1 kHz. The prototype achieves a sensitivity of approximately 2 mV/mV in the passband, a four times lower sensitivity in the stopband, and a power consumption of approximately 3.31 µW. We compare the prototype interface to an interface consisting of an active bandpass filter and a passive voltage doubler using a prerecorded speedboat signal. View Full-Text
Keywords: sensor signal conditioning circuit; event detection application; switched inductor filter; weak signal detection sensor signal conditioning circuit; event detection application; switched inductor filter; weak signal detection
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MDPI and ACS Style

Gazivoda, M.; Bilas, V. Low-Power Sensor Interface with a Switched Inductor Frequency Selective Envelope Detector. Sensors 2021, 21, 2124. https://doi.org/10.3390/s21062124

AMA Style

Gazivoda M, Bilas V. Low-Power Sensor Interface with a Switched Inductor Frequency Selective Envelope Detector. Sensors. 2021; 21(6):2124. https://doi.org/10.3390/s21062124

Chicago/Turabian Style

Gazivoda, Marko; Bilas, Vedran. 2021. "Low-Power Sensor Interface with a Switched Inductor Frequency Selective Envelope Detector" Sensors 21, no. 6: 2124. https://doi.org/10.3390/s21062124

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