NDLI: An eddy-current displacement-to-digital converter based on a ratio-metric delta-sigma ADC

Content Provider	IEEE Xplore Digital Library
Author	Fekri, A. Nabavi, M. Radeljic-Jakic, N. Chang, Z.-Y. Pertijs, M. Nihtianov, S.
Copyright Year	2014
Description	Author affiliation: Electron. Instrum. Lab., Delft Univ. of Technol., Delft, Netherlands (Fekri, A.; Nabavi, M.; Radeljic-Jakic, N.; Chang, Z.-Y.; Pertijs, M.; Nihtianov, S.)
Abstract	This paper describes a smart Eddy-current displacement sensor for use in precision industrial applications. A novel readout scheme based on ratio-metric delta-sigma analog-to-digital conversion is proposed. The system employs two sensing coils incorporated in a low-power front-end oscillator. This produces two anti-phase outputs whose amplitudes are proportional to the inductances of the coils, and are thus a differential function of displacement. After synchronous down-conversion, these signals are fed into a second-order continuous-time delta-sigma modulator that directly produces a digital output that is a ratio-metric function of the coil inductances. This approach eliminates the need for a stable voltage reference, suppresses the oscillator's multiplicative noise contributions, and effectively filters the ripple associated with the down-conversion. The sensors are excited at 15 MHz, which reduces the eddy-current penetration depth to only a few tens of μm. The interface has been realized in a 0.35 μm BiCMOS technology and consumes 18 mW from a 3.3 V supply. In a measurement time of 1 ms, it digitizes the inductance ratio with a resolution of 15 bits, and thus achieves a displacement resolution of 135 nm on a range of 3 mm.
Starting Page	403
Ending Page	406
File Size	2954571
Page Count	4
File Format	PDF
ISBN	9781479956944
ISSN	19308833
e-ISBN	9781479956968
DOI	10.1109/ESSCIRC.2014.6942107
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-09-22
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coils Modulation Oscillators Displacement measurement Current measurement Gain Pollution measurement delta-sigma modulator Eddy current Displacement sensor ratio-metric measurement
Content Type	Text
Resource Type	Article

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