A 105 dB Effective Dynamic Range Self- Capacitance Proximity Sensing System With Consecutive Double-Sided Conversion Technique
- Authors
- Kim, Minsung; Han, Sanghwa; Kim, Suhwan; Rhee, Jooyeol
- Issue Date
- Aug-2023
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Capacitance-to-voltage (C/V) converter; consecutive double-sided conversion (CDSC) technique; delta-sigma analog-to-digital converter (ADC); offset capacitance; one-terminal capacitive sensor; self-capacitance
- Citation
- IEEE SENSORS JOURNAL, v.23, no.16, pp.18325 - 18337
- Journal Title
- IEEE SENSORS JOURNAL
- Volume
- 23
- Number
- 16
- Start Page
- 18325
- End Page
- 18337
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/89060
- DOI
- 10.1109/JSEN.2023.3292274
- ISSN
- 1530-437X
- Abstract
- This article presents a self-capacitance sensing system for proximity sensors with a wide offset capacitance range. Auto-calibration technique is adopted to compensate for the large sensor offset capacitance and achieve high sensitivity and dynamic range (DR). Sensor capacitance is converted to a voltage by a capacitance-to-voltage (C/V) converter that performs conversions during both the charge and discharge phases of operation, which we call consecutive double-sided conversion (CDSC). The conversion technique doubles the number of conversions compared to a conventional structure to improve the power efficiency. The adjustment of an appropriate duty cycle for the clock signal applied in the C/V converter and delta-sigma modulator reduces the power consumption. A prototype chip has been fabricated in a 0.13 mu m CMOS technology. The analog circuits occupy an area of 0.264 mm(2), dissipating 4.04 mW. It achieves an effective DR of 105 dB in a conversion time of 4.1 ms when the offset capacitance is 215 pF.
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