Abstract
A monolithic positioning system operating with absolute coded magnetic scales is presented. The system is intended for precise absolute positioning in industrial applications. Mounted on a tool, the sensor system moves along a stationary scale. A sophisticated comb of sensors reads out the magnetic coding allowing the absolute position to be calculated. The main task has been to cancel the immense sensor offsets. Numerous structures have been measured in order to get statistically assured data of sensitivity and offset variation. A sensor readout technique without large offset cancellation circuitry is discussed. Furthermore a novel linear operational transconductance amplifier (OTA) is shown.
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