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Full-Analog Parasitic Capacitance Compensation for AC-Excited Differential Sensors
- Sisinni, Emiliano (author)
- Depari, A. (author)
- Flammini, A. (author)
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- Ferri, G. (author)
- Stornelli, V. (author)
- Barile, G. (author)
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- Institute of Electrical and Electronics Engineers Inc. 2020
- 2020
- English.
- In: IEEE Transactions on Instrumentation and Measurement. - : Institute of Electrical and Electronics Engineers Inc.. - 0018-9456 .- 1557-9662. ; 69:8, s. 5890-5899
- Journal article (peer-reviewed)
Abstract
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- Capacitive sensors are popular, especially due to the possibility to be integrated together with the readout circuit. In particular, differential implementations are intrinsically insensitive to common-mode noise. Unfortunately, stray capacitances can significantly alter the sensor output value, worsening the performance. This article proposes a novel solution based on an autotuning feedback loop to compensate for parasitic effects, thus preserving measurement performance. In particular, a voltage-controlled negative impedance converter is driven by a feedback loop, in order to control the current flowing in the sensor. The proposed solution can work with the both linear and hyperbolic type of sensors and with any voltage-mode sensor interfaces. An experimental setup, comprising the proposed compensating circuit, a De-Sauty bridge-based sensor front end and an emulated sensor, has been arranged to evaluate obtainable performance. Results show that the linearity error is decreased from more than 10%, without compensation, to less than 1%, when the proposed system is applied. © 1963-2012 IEEE.
Keyword
- Analog circuits
- differential capacitive sensor
- negative impedance converter (NIC)
- parasitic capacitance compensation
- Capacitance
- Capacitive sensors
- Error compensation
- Common mode noise
- Compensating circuits
- Differential sensors
- Linearity errors
- Parasitic capacitance
- Read-out circuit
- Stray capacitances
- Voltage-controlled
- Feedback
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Mid Sweden University
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