2 Citations (Scopus)

Abstract

This paper presents a SC 50 Hz notch filter for an analog to digital acquisition channel in an IoT water management sensor node. The notch filter is used to attenuate the unwanted 50 Hz interference, allowing to reduce the required effective resolution of the ADC, which is a ΣΔ modulator with a sampling frequency of 2 MHz. Due to the large ratio between the sampling frequency and the pole frequency, which increases the capacitor values dispersion, charge division branches are used to allow the delivery of a small charge using a larger capacitor, reducing the capacitor spread. The factor by which the value of the capacitors can be increased is controlled by the number of set/reset cycles that are used in the charge division branches. The maximum number of cycles is dependent on the time constants of each node and the gain value of the amplifiers. The notch filter has a total power dissipation below 300 μW and electrical simulations show an attenuation of approximately 30 dB in the unwanted 50 Hz signal.

Original languageEnglish
Title of host publication2017 IEEE International Symposium on Circuits and Systems (ISCAS)
Subtitle of host publicationFrom Dreams to Innovation
PublisherIEEE
ISBN (Electronic)978-1-4673-6853-7
ISBN (Print)978-1-5090-1427-9
DOIs
Publication statusPublished - 25 Sep 2017
Event50th IEEE International Symposium on Circuits and Systems, ISCAS 2017 - Baltimore, United States
Duration: 28 May 201731 May 2017

Publication series

NameIEEE International Symposium on Circuits and Systems
PublisherIEEE
VolumeSeptember-2017
ISSN (Electronic)0271-4310

Conference

Conference50th IEEE International Symposium on Circuits and Systems, ISCAS 2017
CountryUnited States
CityBaltimore
Period28/05/1731/05/17

Fingerprint

Notch filters
Capacitors
Sampling
Water management
Sensor nodes
Modulators
Poles
Energy dissipation
Internet of things

Keywords

  • Bandpass filters
  • Internet of things
  • Sensor nodes
  • Water management

Cite this

Serra, H., Oliveira, J. P., & Paulino, N. (2017). A 50 Hz SC notch filter for IoT applications. In 2017 IEEE International Symposium on Circuits and Systems (ISCAS): From Dreams to Innovation [8050904] (IEEE International Symposium on Circuits and Systems; Vol. September-2017). IEEE. https://doi.org/10.1109/ISCAS.2017.8050904
Serra, Hugo ; Oliveira, Joao Pedro ; Paulino, Nuno. / A 50 Hz SC notch filter for IoT applications. 2017 IEEE International Symposium on Circuits and Systems (ISCAS): From Dreams to Innovation. IEEE, 2017. (IEEE International Symposium on Circuits and Systems).
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title = "A 50 Hz SC notch filter for IoT applications",
abstract = "This paper presents a SC 50 Hz notch filter for an analog to digital acquisition channel in an IoT water management sensor node. The notch filter is used to attenuate the unwanted 50 Hz interference, allowing to reduce the required effective resolution of the ADC, which is a ΣΔ modulator with a sampling frequency of 2 MHz. Due to the large ratio between the sampling frequency and the pole frequency, which increases the capacitor values dispersion, charge division branches are used to allow the delivery of a small charge using a larger capacitor, reducing the capacitor spread. The factor by which the value of the capacitors can be increased is controlled by the number of set/reset cycles that are used in the charge division branches. The maximum number of cycles is dependent on the time constants of each node and the gain value of the amplifiers. The notch filter has a total power dissipation below 300 μW and electrical simulations show an attenuation of approximately 30 dB in the unwanted 50 Hz signal.",
keywords = "Bandpass filters, Internet of things, Sensor nodes, Water management",
author = "Hugo Serra and Oliveira, {Joao Pedro} and Nuno Paulino",
note = "This work was supported by the Portuguese Foundation for Science and Technology under project PEst-OE/EEI/UI0066/2013 and Ph.D. Grant SFRH/BD/87476/2012, and PROTEUS in the scope of the European Unions H2020 Programme for research, technological development and demonstration under grant agreement No. 644852.",
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Serra, H, Oliveira, JP & Paulino, N 2017, A 50 Hz SC notch filter for IoT applications. in 2017 IEEE International Symposium on Circuits and Systems (ISCAS): From Dreams to Innovation., 8050904, IEEE International Symposium on Circuits and Systems, vol. September-2017, IEEE, 50th IEEE International Symposium on Circuits and Systems, ISCAS 2017, Baltimore, United States, 28/05/17. https://doi.org/10.1109/ISCAS.2017.8050904

A 50 Hz SC notch filter for IoT applications. / Serra, Hugo; Oliveira, Joao Pedro; Paulino, Nuno.

2017 IEEE International Symposium on Circuits and Systems (ISCAS): From Dreams to Innovation. IEEE, 2017. 8050904 (IEEE International Symposium on Circuits and Systems; Vol. September-2017).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - A 50 Hz SC notch filter for IoT applications

AU - Serra, Hugo

AU - Oliveira, Joao Pedro

AU - Paulino, Nuno

N1 - This work was supported by the Portuguese Foundation for Science and Technology under project PEst-OE/EEI/UI0066/2013 and Ph.D. Grant SFRH/BD/87476/2012, and PROTEUS in the scope of the European Unions H2020 Programme for research, technological development and demonstration under grant agreement No. 644852.

PY - 2017/9/25

Y1 - 2017/9/25

N2 - This paper presents a SC 50 Hz notch filter for an analog to digital acquisition channel in an IoT water management sensor node. The notch filter is used to attenuate the unwanted 50 Hz interference, allowing to reduce the required effective resolution of the ADC, which is a ΣΔ modulator with a sampling frequency of 2 MHz. Due to the large ratio between the sampling frequency and the pole frequency, which increases the capacitor values dispersion, charge division branches are used to allow the delivery of a small charge using a larger capacitor, reducing the capacitor spread. The factor by which the value of the capacitors can be increased is controlled by the number of set/reset cycles that are used in the charge division branches. The maximum number of cycles is dependent on the time constants of each node and the gain value of the amplifiers. The notch filter has a total power dissipation below 300 μW and electrical simulations show an attenuation of approximately 30 dB in the unwanted 50 Hz signal.

AB - This paper presents a SC 50 Hz notch filter for an analog to digital acquisition channel in an IoT water management sensor node. The notch filter is used to attenuate the unwanted 50 Hz interference, allowing to reduce the required effective resolution of the ADC, which is a ΣΔ modulator with a sampling frequency of 2 MHz. Due to the large ratio between the sampling frequency and the pole frequency, which increases the capacitor values dispersion, charge division branches are used to allow the delivery of a small charge using a larger capacitor, reducing the capacitor spread. The factor by which the value of the capacitors can be increased is controlled by the number of set/reset cycles that are used in the charge division branches. The maximum number of cycles is dependent on the time constants of each node and the gain value of the amplifiers. The notch filter has a total power dissipation below 300 μW and electrical simulations show an attenuation of approximately 30 dB in the unwanted 50 Hz signal.

KW - Bandpass filters

KW - Internet of things

KW - Sensor nodes

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M3 - Conference contribution

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T3 - IEEE International Symposium on Circuits and Systems

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Serra H, Oliveira JP, Paulino N. A 50 Hz SC notch filter for IoT applications. In 2017 IEEE International Symposium on Circuits and Systems (ISCAS): From Dreams to Innovation. IEEE. 2017. 8050904. (IEEE International Symposium on Circuits and Systems). https://doi.org/10.1109/ISCAS.2017.8050904