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Cai, Z. (author), van Veldhoven, Robert (author), Suy, Hilco (author), de Graaf, G. (author), Makinwa, K.A.A. (author), Pertijs, M.A.P. (author)<br/>book chapter 2019
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Cai, Z. (author), van Veldhoven, Robert (author), Suy, Hilco (author), de Graaf, G. (author), Makinwa, K.A.A. (author), Pertijs, M.A.P. (author)The measurement of carbon-dioxide (CO2) concentration is very important in home and building automation, e.g. to control ventilation in energy-efficient buildings. This application requires compact, low-cost sensors that can measure CO<sub>2</sub> concentration with a resolution of <200 ppm over a 2500ppm range. Conventional optical (NDIR...conference paper 2018
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Cai, Z. (author), van Veldhoven, Robert (author), Suy, Hilco (author), de Graaf, G. (author), Makinwa, K.A.A. (author), Pertijs, M.A.P. (author)This paper presents a readout circuit for a carbon dioxide (CO&#2082;) sensor that measures the CO&#x2082;-dependent thermal time constant of a hot-wire transducer. The readout circuit periodically heats up the transducer and uses a phase-domain &#x0394; &#x03A3; modulator to digitize the phase shift of the resulting...journal article 2018