Searched for: author%3A%22Cai%2C+Z.%22
(1 - 4 of 4)
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Cai, Z. (author), Wiertlewski, M. (author)
The sensation of touching virtual texture and shape can be provided to a touchscreen user by varying the friction force. Despite the saliency of the sensation, this modulated frictional force is purely passive and strictly opposes finger movement. Therefore, it is only possible to create forces along the direction of movement and this...
journal article 2023
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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 (COࠢ) sensor that measures the CO₂-dependent thermal time constant of a hot-wire transducer. The readout circuit periodically heats up the transducer and uses a phase-domain Δ Σ modulator to digitize the phase shift of the resulting...
journal article 2018
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Cai, Z. (author), Rueda Guerrero, Luis E. (author), Louwerse, Alexander Mattheus Robert (author), Suy, Hilco (author), van Veldhoven, Robert (author), Makinwa, K.A.A. (author), Pertijs, M.A.P. (author)
This paper reports a readout circuit capable of accurately measuring not only the resistance of a resistive transducer, but also the power dissipated in it, which is a critical parameter in thermal flow sensors or thermal-conductivity sensors. A front-end circuit, integrated in a standard CMOS technology, sets the voltage drop across the...
journal article 2017
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Cai, Z. (author), van Veldhoven, Robert H.M. (author), Falepin, A. (author), Suy, H. (author), Sterckx, E. (author), Bitterlich, C. (author), Makinwa, K.A.A. (author), Pertijs, M.A.P. (author)
This paper reports a readout circuit for a resistive CO2 sensor, which operates by measuring the CO2-dependent thermal conductivity of air. A suspended hot-wire transducer, which acts both as a resistive heater and temperature sensor, exhibits a CO2-dependent heat loss to the surrounding air, allowing CO2 concentration to be derived from its...
journal article 2016
Searched for: author%3A%22Cai%2C+Z.%22
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