Gazivoda Marko, Bilas Vedran
Faculty of Electrical Engineering and Computing, University of Zagreb, 10000 Zagreb, Croatia.
Sensors (Basel). 2021 Mar 18;21(6):2124. doi: 10.3390/s21062124.
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.
随着了解周围环境的需求不断增长以及传感器制造手段的改进，物联网（IoT）的概念变得越来越有趣。为了实现物联网的连续监测和事件检测，需要开发低功耗传感器和接口。在这项工作中，我们展示了一种新颖的、基于开关电感的声学传感器接口，其具有带通滤波器和包络检波器，对该电路进行了灵敏度、频率选择性和功耗分析，并给出了其设计参数及其对电路特性的定性影响。我们开发了一个原型，并展示了该接口的实验特性以及它在100 Hz至1 kHz的低声频下对高达20 mV峰峰值输入信号的操作情况。该原型在通带内实现了约2 mV/mV的灵敏度，在阻带内灵敏度降低四倍，功耗约为3.31 µW。我们使用预先录制的快艇信号将原型接口与一个由有源带通滤波器和无源倍压器组成的接口进行了比较。
