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Baar, Switzerland

Popovic R.S.,Ecole Polytechnique Federale de Lausanne | Popovic R.S.,SENIS AG
Proceedings of the International Conference on Microelectronics, ICM | Year: 2014

The resolution of a magnetic sensor depends on its intrinsic noise, offset instability and the magnetic sensitivity. Both noise and offset can be substantially reduced by the spinning current technique. The effective magnetic sensitivity can be increased by the application of a magnetic flux concentrator. The physical limit of magnetic sensitivity is estimated. Values of sensitivity, noise and offset of various discrete and integrated horizontal and vertical Hall devices, and of sensor systems are given. High resolution integrated Hall sensors are currently mostly used as compass in mobile phones. © 2014 IEEE.


Popovic R.S.,Ecole Polytechnique Federale de Lausanne | Popovic R.S.,SENIS AG
Informacije MIDEM | Year: 2014

A magnetic angle sensor is a matched combination of a permanent magnet, affixed to a rotating shaft, and a magnetic field sensor. The magnet part of the angle sensors is configured so as to create either a magnetic field with an angle-dependent component perpendicular to the chip surface; or two angle-dependent components parallel with the chip surface. The magnetic field component perpendicular to the sensor dice is measured by planar Hall devices. The two in-plane magnetic field components are measured either by a combination of planar Hall devices and an integrated magnetic flux concentrator (IMC-Hall), or by vertical Hall devices. The IMC-Hall is the most used technology for implementing a compass in mobile telephones. The circular vertical Hall device is most suitable for high-speed rotation angle sensing. The major performance-limiting factors of magnetic angle sensors are non-uniformity of magnets, imperfections in the integrated magnetic sensor IC, and thermal drift. The magnetic sensing part of contemporary magnetic angle sensors is a CMOS IC, incorporating Hall devices, biasing circuit, amplifiers and other analog signal conditioning circuits, analog-to-digital convertors, and digital circuits for angle retrieval and correction of errors. © MIDEM Society.


The invention concerns a magnetic transducer comprising a magnetic field sensor and an electronic circuit. The electronic circuit comprises at least one current source, a transformer, a fully differential preamplifier coupled to the transformer, a phase sensitive detector coupled to the preamplifier and a logic block configured to operate the magnetic field sensor(s) to provide an AC output voltage. The magnetic field sensor(s) is preferably either a Hall element or an AMR sensor or a fluxgate sensor. The invention further concerns a current transducer for measuring a current flowing through a cable, comprising at least one such magnetic transducer and a head with one or more ferromagnetic cores optimized to reduce the effects of external magnetic fields.


Patent
Senis AG | Date: 2013-06-18

The invention concerns a current transducer for measuring a current flowing through a cable, comprising at least one magnetic field sensor and an electronic circuit. The current transducer comprises a head with a ferromagnetic core optimized to reduce the effects of external magnetic fields. The invention further concerns a magnetic transducer comprising a magnetic field sensor and an electronic circuit. The electronic circuit comprises at least one current source, a transformer, a fully differential preamplifier coupled to the transformer, a phase sensitive detector coupled to the preamplifier and a logic block configured to operate the magnetic field sensor(s) to provide an AC output voltage. The magnetic field sensor(s) is preferably either a Hall element or an AMR sensor or a flux-gate sensor.


Patent
Senis AG | Date: 2015-07-08

A vertical Hall device has a deep N-well, two inner contacts, two outer contacts and, optionally, a central contact disposed at a surface of the deep N-well and arranged along a straight symmetry line. The vertical Hall device is designed according to the invention to have an effective width of the outer contacts that is bigger than an effective width of the inner contacts. A shallow highly doped P

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