TY - GEN A1 - Killat, Dirk A1 - Kluge, Johannes von A1 - Umbach, Frank A1 - Langenheinrich, Werner A. A1 - Schmitz, Richard T1 - Measurement and modelling of sensitivity and noise of MOS magnetic field-effect transistors T2 - Sensors and Actuators : A, Physical N2 - The characteristics of magnetic field-sensitive split-drain MOSFETs (MAGFETs) have been experimentally measured. The sensitivity depends on the geometry and the operating point of the MAGFET. Particular attention is paid to the lateral parasitic conductance between the split drains. The equivalent spectral noise density of the magnetic flux density is measured. Additionally, a macro-model of the MAGFET has been developed for SPICE. KW - Modelling KW - Magfets KW - Mosfets Y1 - 1997 U6 - https://doi.org/10.1016/S0924-4247(97)80286-5 SN - 0924-4247 VL - 61 IS - 1-3 SP - 346 EP - 351 ER - TY - CHAP A1 - Killat, Dirk A1 - Kluge, Johannes von A1 - Umbach, Frank A1 - Langenheinrich, Werner A. A1 - Schmitz, Richard T1 - Sensitivity and Noise of MOS magnetic field effect transistors T2 - Proceedings of the 26th European Solid State Device Research Conference, Congress Centre, Bologna, Italy, 9 - 11 September 1996 Y1 - 1996 SN - 2-86332-196-X SP - 111 EP - 114 PB - Ed. Frontieres CY - Gif-sur-Yvette ER - TY - GEN A1 - Killat, Dirk A1 - Langenheinrich, Werner A. T1 - Signal processing for magnetic micro torque sensors T2 - Sensors and Actuators A: Physical N2 - A novel type of signal processing for a magnetic micro torque sensor is described and simulated. The sensor principles are based on a soft magnetic core shaped as a yoke, two current-carrying coils, a soft magnetic amorphous ribbon with strong magnetostrictive properties that is fixed on a shaft, and at least two magnetic flux-density sensors. The sensor determines directly the change of permeability of the amorphous ribbon on the shaft. Nevertheless, the variation of the air gap between the sensor and the rotating shaft affects the measurement principle. Therefore, the magnetic flux density is measured at two positions, one at the face of the soft magnetic core and the other beside the face of the core in the area of the stray flux. The evaluation of these two flux densities yields the distance between the sensor and the shaft as well as the permeability of the amorphous ribbon. The problem arising with this practice is the determination of the sensitivity of the flux-density sensors. As the current-carrying coils are alternately operated in a common and a push-pull mode, the unknown sensitivities of the flux-density sensors do not affect the evaluation of the permeability of the amorphous ribbon on the shaft. Y1 - 1995 U6 - https://doi.org/10.1016/0924-4247(94)00913-3 SN - 0924-4247 VL - 46 IS - 1-3 SP - 315 EP - 319 ER -