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Current Input Pixel-Level ADC with High SNR and Wide Dynamic Range for a Microbolometer

A readout circuit incorporating a pixel-level analog-to-digital converter (ADC) is studied for two-dimensional medium wavelength infrared microbolometer arrays. The signal-to-noise ratio (SNR) and charge handling capacity of the unit cell circuit are improved by using the current input pixel-level A...

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Detalles Bibliográficos
Autores principales: Lee, Jeongho, Nam, Ilku, Woo, DooHyung
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8038042/
https://www.ncbi.nlm.nih.gov/pubmed/33800617
http://dx.doi.org/10.3390/s21072354
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author Lee, Jeongho
Nam, Ilku
Woo, DooHyung
author_facet Lee, Jeongho
Nam, Ilku
Woo, DooHyung
author_sort Lee, Jeongho
collection PubMed
description A readout circuit incorporating a pixel-level analog-to-digital converter (ADC) is studied for two-dimensional medium wavelength infrared microbolometer arrays. The signal-to-noise ratio (SNR) and charge handling capacity of the unit cell circuit are improved by using the current input pixel-level ADC. The charge handling capacity of the integrator is appropriately extended to maximize the integration time regardless of the magnitude of the input current and low power supply voltage. The readout circuit was fabricated using a 0.35-μm 2-poly 4-metal CMOS process for a 640 × 512 array with a pixel size of 40 μm × 40 μm. The peak SNR and dynamic range are 77.1 and 80.1 dB, respectively, with a power consumption of 0.62 μW per pixel.
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spelling pubmed-80380422021-04-12 Current Input Pixel-Level ADC with High SNR and Wide Dynamic Range for a Microbolometer Lee, Jeongho Nam, Ilku Woo, DooHyung Sensors (Basel) Communication A readout circuit incorporating a pixel-level analog-to-digital converter (ADC) is studied for two-dimensional medium wavelength infrared microbolometer arrays. The signal-to-noise ratio (SNR) and charge handling capacity of the unit cell circuit are improved by using the current input pixel-level ADC. The charge handling capacity of the integrator is appropriately extended to maximize the integration time regardless of the magnitude of the input current and low power supply voltage. The readout circuit was fabricated using a 0.35-μm 2-poly 4-metal CMOS process for a 640 × 512 array with a pixel size of 40 μm × 40 μm. The peak SNR and dynamic range are 77.1 and 80.1 dB, respectively, with a power consumption of 0.62 μW per pixel. MDPI 2021-03-28 /pmc/articles/PMC8038042/ /pubmed/33800617 http://dx.doi.org/10.3390/s21072354 Text en © 2021 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 (http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) ).
spellingShingle Communication
Lee, Jeongho
Nam, Ilku
Woo, DooHyung
Current Input Pixel-Level ADC with High SNR and Wide Dynamic Range for a Microbolometer
title Current Input Pixel-Level ADC with High SNR and Wide Dynamic Range for a Microbolometer
title_full Current Input Pixel-Level ADC with High SNR and Wide Dynamic Range for a Microbolometer
title_fullStr Current Input Pixel-Level ADC with High SNR and Wide Dynamic Range for a Microbolometer
title_full_unstemmed Current Input Pixel-Level ADC with High SNR and Wide Dynamic Range for a Microbolometer
title_short Current Input Pixel-Level ADC with High SNR and Wide Dynamic Range for a Microbolometer
title_sort current input pixel-level adc with high snr and wide dynamic range for a microbolometer
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8038042/
https://www.ncbi.nlm.nih.gov/pubmed/33800617
http://dx.doi.org/10.3390/s21072354
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