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Micromachines 2018, 9(7), 347; https://doi.org/10.3390/mi9070347

Reconfigurable Sensor Analog Front-End Using Low-Noise Chopper-Stabilized Delta-Sigma Capacitance-to-Digital Converter

1
Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea
2
LeoLSI Co., Ltd., Seoul 06728, Korea
*
Author to whom correspondence should be addressed.
Received: 15 May 2018 / Revised: 29 June 2018 / Accepted: 9 July 2018 / Published: 10 July 2018
(This article belongs to the Special Issue Interface Circuits for Microsensor Integrated Systems)
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Abstract

This paper proposes a reconfigurable sensor analog front-end using low-noise chopper-stabilized delta-sigma capacitance-to-digital converter (CDC) for capacitive microsensors. The proposed reconfigurable sensor analog front-end can drive both capacitive microsensors and voltage signals by direct conversion without a front-end amplifier. The reconfigurable scheme of the front-end can be implemented in various multi-mode applications, where it is equipped with a fully integrated temperature sensor. A chopper stabilization technique is implemented here to achieve a low-noise characteristic by reducing unexpected low-frequency noises such as offsets and flicker noise. The prototype chip of the proposed sensor analog front-end is fabricated by a standard 0.18-μm 1-poly-6-metal (1P6M) complementary metal-oxide-semiconductor (CMOS) process. It occupies a total active area of 5.37 mm2 and achieves an effective resolution of 16.3-bit. The total power consumption is 0.843 mW with a 1.8 V power supply. View Full-Text
Keywords: capacitive microsensor; analog front-end (AFE); capacitive sensor interface circuit; reconfigurable sensor readout circuit; delta-sigma modulation; capacitance-to-digital converter (CDC); temperature sensor; low-noise technique; chopper stabilization capacitive microsensor; analog front-end (AFE); capacitive sensor interface circuit; reconfigurable sensor readout circuit; delta-sigma modulation; capacitance-to-digital converter (CDC); temperature sensor; low-noise technique; chopper stabilization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kim, H.; Lee, B.; Mun, Y.; Kim, J.; Han, K.; Roh, Y.; Song, D.; Huh, S.; Ko, H. Reconfigurable Sensor Analog Front-End Using Low-Noise Chopper-Stabilized Delta-Sigma Capacitance-to-Digital Converter. Micromachines 2018, 9, 347.

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