Low power wireless sensor node for use in building automation

Gamm, Gerd Ulrich; Kostić, Miloš; Sippel, Matthias; Reindl, L.

doi:10.1109/wamicon.2011.5872856

Cited by 2 publications

(1 citation statement)

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“…Moreover, their power consumption, e.g. 220 mW for a typical NDIR-based CO 2 sensor [9], far exceeds what is needed in next-generation wireless sensor nodes for HABA systems [10].…”

Section: Introductionmentioning

confidence: 99%

A Ratiometric Readout Circuit for Thermal-Conductivity-Based Resistive CO₂Sensors

Cai

Veldhoven

Falepin

et al. 2016

IEEE J. Solid-State Circuits

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This paper reports a readout circuit for a resistive CO 2 sensor, which operates by measuring the CO 2-dependent thermal conductivity of air. A suspended hot-wire transducer, which acts both as a resistive heater and temperature sensor, exhibits a CO 2-dependent heat loss to the surrounding air, allowing CO 2 concentration to be derived from its temperature rise and power dissipation. The circuit employs a dual-mode incremental delta-sigma ADC to digitize these parameters relative to those of an identical, but isolated, reference transducer. This ratiometric approach results in a measurement that does not require precision voltage or power references. The readout circuit uses dynamically-swapped transducer pairs to cancel their baseline-resistance, so as to relax the required dynamic range of the ADC. In addition, dynamic element matching (DEM) is used to bias the transducer pairs at an accurate current ratio, making the measurement insensitive to the precise value of the bias current. The readout circuit has been implemented in a standard 0.16 µm CMOS technology. With commercial resistive micro-heaters, a CO 2 sensing resolution of about 200 ppm (1σ) was achieved in a measurement time of 30 s.

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“…Moreover, their power consumption, e.g. 220 mW for a typical NDIR-based CO 2 sensor [9], far exceeds what is needed in next-generation wireless sensor nodes for HABA systems [10].…”

Section: Introductionmentioning

confidence: 99%

A Ratiometric Readout Circuit for Thermal-Conductivity-Based Resistive CO₂Sensors

Cai

Veldhoven

Falepin

et al. 2016

IEEE J. Solid-State Circuits

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Sleeping Techniques for Reducing Energy Dissipation

Muraleedharan

Demirkol

et al. 2013

The Art of Wireless Sensor Networks

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Low power wireless sensor node for use in building automation

Cited by 2 publications

References 5 publications

A Ratiometric Readout Circuit for Thermal-Conductivity-Based Resistive CO₂Sensors

A Ratiometric Readout Circuit for Thermal-Conductivity-Based Resistive CO₂Sensors

Sleeping Techniques for Reducing Energy Dissipation

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Low power wireless sensor node for use in building automation

Cited by 2 publications

References 5 publications

A Ratiometric Readout Circuit for Thermal-Conductivity-Based Resistive CO2Sensors

A Ratiometric Readout Circuit for Thermal-Conductivity-Based Resistive CO2Sensors

Sleeping Techniques for Reducing Energy Dissipation

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Product

Resources

About

A Ratiometric Readout Circuit for Thermal-Conductivity-Based Resistive CO₂Sensors

A Ratiometric Readout Circuit for Thermal-Conductivity-Based Resistive CO₂Sensors