Sensors and Materials
ISSN 0914-4935

Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Low-Noise Reconfigurable 12- to 16-bit Delta-Sigma Capacitance-to-Digital Converter with Chopper Stabilization Technique

Byeoncheol Lee, Youngwoon Ko, Hyungseup Kim, Yeongjin Mun, Seounghoon Huh, Dongkyu Song, Youngtaek Roh, and Hyoungho Ko

(Received April 5, 2017; Accepted January 22, 2018)

Keywords: capacitance-to-digital converter (CDC), delta-sigma capacitance-to-digital converter, chopper stabilization, reconfigurable resolution

This paper presents a first-order delta-sigma (ΔΣ) capacitance-to-digital converter (CDC) with low noise characteristics and a reconfigurable resolution of 12- to 16-bit. The proposed ΔΣ CDC is implemented as a first-order ΔΣ modulator with a switched capacitor (SC) integrator and comparator. The resolution can be reconfigured by the accumulator using the reconfigurable 12- to 16-bit up-counter. The ΔΣ schemes are widely used for low noise applications owing to the ΔΣ modulator’s ability to reduce in-band white noise by its inherent noise-shaping characteristic. The low-frequency colored noises such as flicker (1/f) noises still remain. In order to reduce the low-frequency colored noise component, a chopper stabilization technique is exploited using the SC integrator of the ΔΣ CDC. The proposed ΔΣ CDC also controls the offset calibration capacitors that adjust the DC offset. This is caused by a capacitor mismatch owing to process variation and the parasitic capacitance of the input capacitive sensor. The ΔΣ CDC is fabricated by using the standard 0.18 μm 1P6M complementary metal-oxide-semiconductor (CMOS) process with an active area of 0.66 mm2. The total current consumption for the 16-bit ΔΣ CDC is 141 μA with a 1.8 V supply.

Corresponding author: Hyoungho Ko




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