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A novel architecture for inductive proximity sensors using sigma delta modulation

: Thoß, S.; Machul, O.; Hosticka, B.J.


Schmitt-Landsiedel, D. ; TU München; Institute of Electrical and Electronics Engineers -IEEE-:
ESSCIRC 2007, 33rd European Solid-State Circuits Conference. Proceedings : September 10-14, 2007, München, Germany
New York, NY: IEEE, 2007
European Solid State Circuits Conference (ESSCIRC) <33, 2007, München>
Conference Paper
Fraunhofer IMS ()
inductive proximity sensor; Sigma-Delta Modulation; analog-to-digital conversion; induktiver Näherungssensor; Analog-Digital-Umsetzer

This paper presents a novel architecture for inductive proximity sensors using sigma delta modulation. The LC-oscillator is included in the sigma delta control loop providing amplitude regulation and high precision analog-to-digital conversion in one block. The circuit consists of a new LC-oscillator suitable for clocked tail current injection, two SC integrators and a clocked comparator forming the sigma delta modulator and a PLL providing the clock for synchron amplitude sampling. The circuit was realized in a 0.8µm CMOS technology of the Fraunhofer Institute for Microelectronic Circuits and Systems. Measurements show the capability of the system to distinguish even smallest differences in the target distance.