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This paper presents an ultra-low-power, widedynamic- range interface circuit for capacitive and resistive sensors. The circuit is implemented as a switched-capacitor circuit using programmable capacitors to achieve high configurability. The circuit was fabricated using a CMOS 0.18 μm process. Different types of capacitive and resistive sensors were measured using the interface to demonstrate its support for multi-sensor systems with an ultra-low-power budget. Experimental results show that the circuit is able to interface various sensors within the overall capacitance range of 0.6–550 pF and resistance range of 3.7–5100 k , while consuming only 0.39–3.56 μW from a 1.2 V supply. A proximity, gesture, and touch-sensing system is also developed consisting of the designed interface circuit and a sensor element that is able to detect the displacement of an object up to 15 cm from the sensing electrodes consuming only 0.83 μW from a 1.2 V supply.
|Number of pages||12|
|Journal||IEEE Sensors Journal|
|Early online date||2 Jun 2020|
|Publication status||Published - 15 Oct 2020|
|MoE publication type||A1 Journal article-refereed|
- Capacitive sensors
- Force sensor
- Humidity sensor
- Interface circuits
- Internet of Things (IoT)
- gesture detection
- Resistive sensors
- Switched capacitor circuits
- Ultra low power
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- 3 Finished
Energy autonomous wireless sensor systems powered by printed light energy harvesting and storage
Halonen, K., Singh, G., Monga, D., Haapala, T., Pulkkinen, M., Tanweer, M. & Moayer, M. M.
01/09/2018 → 30/11/2021
Project: Academy of Finland: Other research funding
Aalto: Towards Digital Paradise
Halonen, K., Moayer, M. M., Haapala, T., Pulkkinen, M., Salomaa, J. & Saarinen, V.
01/01/2017 → 31/12/2018
Project: Business Finland: Other research funding
The Naked Approach
Halonen, K., Moayer, M. M., Pulkkinen, M., Salomaa, J. & Haapala, T.
01/03/2015 → 30/06/2018
Project: Business Finland: Strategic research openings