0.5 V and 0.43 pJ/bit Capacitive Sensor Interface for Passive Wireless Sensor Systems
AbstractThis paper presents an ultra low-power and low-voltage pulse-width modulation based ratiometric capacitive sensor interface. The interface was designed and fabricated in a standard 90 nm CMOS 1P9M technology. The measurements show an effective resolution of 10 bits using 0.5 V of supply voltage. The active occupied area is only 0.0045 mm2 and the Figure of Merit (FOM), which takes into account the energy required per conversion bit, is 0.43 pJ/bit. Furthermore, the results show low sensitivity to PVT variations due to the proposed ratiometric architecture. In addition, the sensor interface was connected to a commercial pressure transducer and the measurements of the resulting complete pressure sensor show a FOM of 0.226 pJ/bit with an effective linear resolution of 7.64 bits. The results validate the use of the proposed interface as part of a pressure sensor, and its low-power and low-voltage characteristics make it suitable for wireless sensor networks and low power consumer electronics. View Full-Text
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Beriain, A.; Gutierrez, I.; Solar, H.; Berenguer, R. 0.5 V and 0.43 pJ/bit Capacitive Sensor Interface for Passive Wireless Sensor Systems. Sensors 2015, 15, 21554-21566.
Beriain A, Gutierrez I, Solar H, Berenguer R. 0.5 V and 0.43 pJ/bit Capacitive Sensor Interface for Passive Wireless Sensor Systems. Sensors. 2015; 15(9):21554-21566.Chicago/Turabian Style
Beriain, Andoni; Gutierrez, Iñigo; Solar, Hector; Berenguer, Roc. 2015. "0.5 V and 0.43 pJ/bit Capacitive Sensor Interface for Passive Wireless Sensor Systems." Sensors 15, no. 9: 21554-21566.