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- Barile, Gianluca, et al.
(författare)
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A standard CMOS bridge-based analog interface for differential capacitive sensors
- 2017
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Ingår i: PRIME 2017 - 13th Conference on PhD Research in Microelectronics and Electronics, Proceedings. - : IEEE. - 9781509065073 ; , s. 281-284
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Konferensbidrag (refereegranskat)abstract
- This work describes an analog electronic interface, based on a modified De Sauty AC bridge, performing a differential capacitive sensor estimation. A suitable feedback loop tunes a Voltage Controlled Resistor to balance the bridge. The electronic circuit has been designed in a standard integrated CMOS technology (AMS 0.35μm) with a low supply voltage (±1.5 V) and a reduced power consumption (lower than 4mW). PSpice simulation results show a very good agreement with theoretical expectations. The output voltage accuracy shows a 0.03V maximum absolute error for a range of ±50% of sensor variations from its baseline value. Very small baseline values are allowed (tens of μF).
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| 2. |
- Barile, Gianluca, et al.
(författare)
-
Linear Integrated Interface for Automatic Differential Capacitive Sensing
- 2017
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Ingår i: Proceedings, Volume 1, Eurosensors 2017. - Basel Switzerland : MDPI.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In this work, the authors introduce a new full-analog front-end for differential capacitance sensors which provides a DC output voltage, directly proportional to the measurand variations. The readout circuit architecture is based on a De Sauty bridge as core of the capacitive sensing whereas the feedback circuitry performs the bridge autobalancing operation by means of changes in a multiplier output. The circuit is designed in a standard CMOS technology (AMS 0.35 µm) so is suitable for portable systems. Simulated results have shown a good agreement with the theoretical model being the percentage relative error less than 2.5%. Interface sensitivity is constant and values around 0.055 V/mm for the considered application.
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