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A 10-mW two-channel fully integrated system-on-chip for eddy-current position sensing [in biomedical devices]

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4 Author(s)
M. Oberle ; Integrated Syst. Lab., Swiss Fed. Inst. of Technol., Zurich, Switzerland ; R. Reutemann ; R. Hertle ; Qiuting Huang

The use of magnetic bearings in small biomedical devices poses new challenges for the integration of complex embedded electronic systems. This paper describes a low-power fully integrated two-channel system-on-a-chip (SOC) for two-dimensional (2-D) differential position sensing in magnetic bearings through two pairs of eddy current sensors. It consists of a 312.5 kHz switched-capacitor (SC) sine-wave generator, a two-channel data acquisition unit including a 19-dB quadruple difference instrumentation amplifier, and a demodulating 12-bit ΣΔ analog-to-digital (A/D) converter with DSP-compatible serial interface. A signal-to-noise-plus-distortion ratio (SNDR) of more than 60 dB has been achieved, which corresponds to a resolution of better than 3 μm at a maximum displacement range of 3 mm. The entire system has been integrated in a standard 0.6-μm CMOS technology and consumes 10 mW at a 2.7-V supply

Published in:

IEEE Journal of Solid-State Circuits  (Volume:37 ,  Issue: 7 )