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Micromachines (Basel). 2018 Jul 10;9(7). pii: E347. doi: 10.3390/mi9070347.

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

Author information

1
Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea. hyungseup@cnu.ac.kr.
2
Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea. dada5891@cnu.ac.kr.
3
Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea. ansdud159@cnu.ac.kr.
4
Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea. jskim1@cnu.ac.kr.
5
Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea. kshan1@cnu.ac.kr.
6
LeoLSI Co., Ltd., Seoul 06728, Korea. ytroh@leolsi.com.
7
LeoLSI Co., Ltd., Seoul 06728, Korea. dksong@leolsi.com.
8
LeoLSI Co., Ltd., Seoul 06728, Korea. iamtoto@leolsi.com.
9
Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea. hhko@cnu.ac.kr.

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.

KEYWORDS:

analog front-end (AFE); capacitance-to-digital converter (CDC); capacitive microsensor; capacitive sensor interface circuit; chopper stabilization; delta-sigma modulation; low-noise technique; reconfigurable sensor readout circuit; temperature sensor

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