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PLL-Based Readout Circuit for SiC-MOS Capacitor Hydrogen Sensors in Industrial Environments
For proper operation in real industrial conditions, gas sensors require readout circuits which offer accuracy, noise robustness, energy efficiency and portability. We present an innovative, dedicated readout circuit with a phase locked loop (PLL) architecture for SiC-MOS capacitor sensors. A hydroge...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8879939/ https://www.ncbi.nlm.nih.gov/pubmed/35214371 http://dx.doi.org/10.3390/s22041462 |
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author | Enache, Andrei Draghici, Florin Mitu, Florin Pascu, Razvan Pristavu, Gheorghe Pantazica, Mihaela Brezeanu, Gheorghe |
author_facet | Enache, Andrei Draghici, Florin Mitu, Florin Pascu, Razvan Pristavu, Gheorghe Pantazica, Mihaela Brezeanu, Gheorghe |
author_sort | Enache, Andrei |
collection | PubMed |
description | For proper operation in real industrial conditions, gas sensors require readout circuits which offer accuracy, noise robustness, energy efficiency and portability. We present an innovative, dedicated readout circuit with a phase locked loop (PLL) architecture for SiC-MOS capacitor sensors. A hydrogen detection system using this circuit is designed, simulated, implemented and tested. The PLL converts the MOS nonlinear small-signal capacitance (affected by hydrogen) into an output voltage proportional to the detected gas concentration. Thus, the MOS sensing element is part of the PLL’s voltage-controlled oscillator. This block effectively provides a small AC signal (around 70 mV at 1 MHz) for the sensor and acquires its response. The correct operation of the proposed readout circuit is validated by simulations and experiments. Hydrogen measurements are performed for concentrations up to 1600 ppm. The PLL output exhibited voltage variations close to those discernable from experimental C-V curves, acquired with a semiconductor characterization system, for all investigated MOS sensor samples. |
format | Online Article Text |
id | pubmed-8879939 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-88799392022-02-26 PLL-Based Readout Circuit for SiC-MOS Capacitor Hydrogen Sensors in Industrial Environments Enache, Andrei Draghici, Florin Mitu, Florin Pascu, Razvan Pristavu, Gheorghe Pantazica, Mihaela Brezeanu, Gheorghe Sensors (Basel) Article For proper operation in real industrial conditions, gas sensors require readout circuits which offer accuracy, noise robustness, energy efficiency and portability. We present an innovative, dedicated readout circuit with a phase locked loop (PLL) architecture for SiC-MOS capacitor sensors. A hydrogen detection system using this circuit is designed, simulated, implemented and tested. The PLL converts the MOS nonlinear small-signal capacitance (affected by hydrogen) into an output voltage proportional to the detected gas concentration. Thus, the MOS sensing element is part of the PLL’s voltage-controlled oscillator. This block effectively provides a small AC signal (around 70 mV at 1 MHz) for the sensor and acquires its response. The correct operation of the proposed readout circuit is validated by simulations and experiments. Hydrogen measurements are performed for concentrations up to 1600 ppm. The PLL output exhibited voltage variations close to those discernable from experimental C-V curves, acquired with a semiconductor characterization system, for all investigated MOS sensor samples. MDPI 2022-02-14 /pmc/articles/PMC8879939/ /pubmed/35214371 http://dx.doi.org/10.3390/s22041462 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Enache, Andrei Draghici, Florin Mitu, Florin Pascu, Razvan Pristavu, Gheorghe Pantazica, Mihaela Brezeanu, Gheorghe PLL-Based Readout Circuit for SiC-MOS Capacitor Hydrogen Sensors in Industrial Environments |
title | PLL-Based Readout Circuit for SiC-MOS Capacitor Hydrogen Sensors in Industrial Environments |
title_full | PLL-Based Readout Circuit for SiC-MOS Capacitor Hydrogen Sensors in Industrial Environments |
title_fullStr | PLL-Based Readout Circuit for SiC-MOS Capacitor Hydrogen Sensors in Industrial Environments |
title_full_unstemmed | PLL-Based Readout Circuit for SiC-MOS Capacitor Hydrogen Sensors in Industrial Environments |
title_short | PLL-Based Readout Circuit for SiC-MOS Capacitor Hydrogen Sensors in Industrial Environments |
title_sort | pll-based readout circuit for sic-mos capacitor hydrogen sensors in industrial environments |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8879939/ https://www.ncbi.nlm.nih.gov/pubmed/35214371 http://dx.doi.org/10.3390/s22041462 |
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