An Integrated Thermopile-Based Sensor with a Chopper-Stabilized Interface Circuit for Presence Detection
Articolo
Data di Pubblicazione:
2019
Abstract:
This paper presents a sensor-readout circuit system suitable for presence detection. The sensor consists of a miniaturized polysilicon thermopile, realized employing MEMS micromachining by STMicroelectronics, featuring a responsivity value equal to 180 V/W, with 13 ms response time. The readout circuit is implemented in a standard 130-nm CMOS process. As the sensor output signal behaves substantially as a DC, the interface circuit employs the chopper technique in order to minimize offset and noise contributions at low frequency, achieving a measured input referred offset standard deviation equal to 1.36 μ V. Measurements show that the presented system allows successfully detecting the presence of a person in a room standing at 5.5 m from the sensor. Furthermore, the correct operation of the system with moving targets, considering people either walking or running, was also demonstrated.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
CMOS; MEMS; chopper; occupancy detection; presence detection; thermal sensor; thermopile
Elenco autori:
Moisello, Elisabetta; Vaiana, Michele; Castagna, Maria Eloisa; Bruno, Giuseppe; Malcovati, Piero; Bonizzoni, Edoardo
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