BG108430A - Microsensor for magnetic field - Google Patents

Abstract

The microsensor for magnetic field is used in the field of instrumentation engineering, weak field magnetometric, sensor and microsystems engineering, in contactless automation, in instrumentation engineering, the electric power industry, electrical engineering and others in the elimination of Hall's low efficiency effect in the magnetic field converters. The magnetic field microsensor comprises a semi-conductor substrate of mixed type conductivity, on one of the sides of which at equal distances from each other three identically rectangular-shaped ohmic contacts are formed - one central and symmetrically to it - one end ohmic contact each. All contacts are positioned parallel to their long sides. The central ohmic contact, across a current source, trimmer and respective load resistor is connected to the two end ohmic contacts. The external magnetic field is applied parallel to the long sides of the rectangular contacts, being the two end ohmic contacts representing the output. On thesurface of the semi-conductor substrate (1), between the central (2) and the two end ohmic contacts (3 & 4) one more each internal ohmic contacts (5 and 6) and one each emitter p-n transition (7 and 8) are formed in series, all having rectangular shape and being parallel to the remaining contacts (2, 3 and 4). The polarity of the central Ohmic contact (2) matches that of a p-n transition switchedin straight direction, the inner ohmic contacts (5 and 6) are coupled to the two emitter p-n transitions (7 and 8), respectively.