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This paper reports on a new component which allows a mechanical position to be accurately detected. This component is a magnetically actuated microswitch fabricated in MEMS technology. Unlike the well-known Reed or Hall switches components this magnetic microswitch offers all of the following advantages: (1) a powerless sensor, (2) a highly integrated sensor (less than 3 mm3), (3) an electrical isolation...
This paper reports on the reliability issues encountered during the development of a dry ohmic switch fabricated in MEMS technology. Particularly, focus is made on electrical contact reliability. Contact degradation during hot switching tests has been noticed, and leads to switch lifetime limitation. In order to understand this phenomenon, characterizations have been performed on damaged switches...
Parallel audio amplifier are hybrid amplifiers that couple a linear and a switching stage with a parallel connection. A proper control must be designed so that the voltage is controlled by the linear stage, while most of the current is driven by the switching stage. So doing the overall architecture achieves the typical efficiency of the switching stage and the distortion of the linear stage. In summary...
A method for measuring a weak magnetic field with a Hall sensor is described. This method consists of chopping the magnetic field to be measured with a magnetic shield surrounding the Hall sensor. The magnetic shield is periodically driven into saturation by means of an excitation coil. Thus, the Hall device is alternately exposed to/shielded from the d.c. or slowly varying external field to be measured...
We present a new magnetic sensor based on the Hall effect, sensitive to a cylindrical magnetic field. Such a field is found around a wire carrying a current or under the gap between magnetic concentrators. Compared to traditional (plate-like) Hall devices, the geometry of the cylindrical Hall device allows lower bias voltage and lower offset to be achieved. The combination of this new device with...
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