A 17.4-b Delta-Sigma Capacitance-to-Digital Converter for One-Terminal Capacitive Sensors
- Authors
- Jung, Youngjae; Duan, Quanzhen; Roh, Jeongjin
- Issue Date
- Oct-2017
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Capacitance-to-digital converter (CDC); delta-sigma modulation; one-terminal capacitive sensor
- Citation
- IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, v.64, no.10, pp.1122 - 1126
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
- Volume
- 64
- Number
- 10
- Start Page
- 1122
- End Page
- 1126
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/8947
- DOI
- 10.1109/TCSII.2015.2505960
- ISSN
- 1549-7747
- Abstract
- In this brief, we present a capacitance-to-digital converter (CDC) for one-terminal capacitive sensors. The designed CDC implements a digital correction technique to reduce non-idealities and noises, such as the offset, 1/f noise, and power supply noise. This correction technique can also minimize effectively the complexity of the analog front-end circuit. All sensor functions, including analog circuits (delta-sigma CDC, bandgap reference, and voltage regulator) and digital logics (microprocessor, memories, and interface logics), are integrated into a single chip and occupy approximately 90% of the area. The chip is fabricated in a 0.18-mu m standard CMOS process, which does not have a deep n-well stage. The analog and digital circuits, including the digital input/output pads, must share the same substrate in this design. However, the measurement results demonstrate highly effective resolutions of 16 to 17.4 b, which are achieved with different conversion times.
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