scholarly journals A Programmable 3-Channel Acoustic Wake-Up Interface Enabling Always-On Detection of Underwater Events within 20 µA

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 768 ◽  
Author(s):  
Dinko Oletic ◽  
Marko Gazivoda ◽  
Vedran Bilas
Keyword(s):  
Low Power ◽  
Real World ◽  
Sensor Interface ◽  
Ultra Low Power ◽  
Mixed Signal ◽  
Frequency Bands ◽  
Time Frequency ◽  
Current Consumption ◽  
Acoustic Surveillance ◽  
Frequency Features

We present an always-on acoustic wake-up sensor interface, designed for prolonging the autonomy of energy-hungry hardware for underwater acoustic surveillance. Proposed design enables the detection of a passing ship by simultaneous listening up to three arbitrarily defined frequency-bands within the 2.5 kHz range, and generates a wake-up signal upon finding a match with a digitally preset template describing signal’s discriminatory time-frequency features. In this paper, we propose the architecture of such fully programmable, multichannel, mixed-signal wake- up circuit. We show the implementation of a PCB prototype, characterize its sensitivity, analyze its current consumption, and verify its response on real-world hydrophone recordings. It is demonstrated that the design consumes only 6.4 µA per channel (in total <20 µA) with ultra-low- power COTS components, while listening.

An Ultra-Low-Power Long Range Battery/Passive RFID Tag for UHF and Microwave Bands With a Current Consumption of 700 nA at 1.5 V

2007 ◽  
Vol 54 (7) ◽  
pp. 1500-1512 ◽  
Author(s):  
Vijay Pillai ◽  
Harley Heinrich ◽  
David Dieska ◽  
Pavel V. Nikitin ◽  
Rene Martinez ◽  
...  
Keyword(s):  
Low Power ◽  
Long Range ◽  
Ultra Low Power ◽  
Rfid Tag ◽  
Current Consumption ◽  
Passive Rfid ◽  
A Current

An Ultra-Low Power Holter and Low Complexity Design Using Mixed Signal Processor

2013 ◽  
Vol 284-287 ◽  
pp. 1627-1632
Author(s):  
Hsieh Chang Huang ◽  
Ching Tang Hsieh ◽  
Guang Lin Hsieh
Keyword(s):  
Low Power ◽  
Analog Circuits ◽  
Finite Impulse Response ◽  
Low Complexity ◽  
Fir Filter ◽  
Ecg Signal ◽  
Ultra Low Power ◽  
Mixed Signal ◽  
Sd Card ◽  
Signal Processor

An ultra-low power, portable, and easily implemented Holter recorder is necessary for patients or researchers of electrocardiogram (ECG). Such a Holter recorder with off-the-shelf components is realized with mixed signal processor (MSP) in this paper. To decrease the complexity of analog circuits and the interference of 60 Hz noise from power line, we use the MSP to implement a finite impulse response (FIR) filter which is equiripple design. We also integrate the ring buffer for the input samples and the symmetrical characteristic of the FIR filter for efficiently computing convolution. The experimental results show that the ECG output signal with the PQRST feature is easy to be distinguished. This ECG signal is recorded for 24 hours using a SD card. Furthermore, the ECG signal is transmitted with a smartphone via Bluetooth to decrease the burden of the Holter recorder. As a result, this paper uses the Lomb method for the spectral analysis of Heart Rate Variability (HRV) better than Fast Fourier Transform (FFT).

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