title: A non-invasive thermal drift compensation technique applied to a spin-valve magnetoresistive current sensor.
abstract: A compensation method for the sensitivity drift of a magnetoresistive (MR) Wheatstone bridge current sensor is proposed. The technique was carried out by placing a ruthenium temperature sensor and the MR sensor to be compensated inside a generalized impedance converter circuit (GIC). No internal modification of the sensor bridge arms is required so that the circuit is capable of compensating practical industrial sensors. The method is based on the temperature modulation of the current supplied to the bridge, which improves previous solutions based on constant current compensation. Experimental results are shown using a microfabricated spin-valve MR current sensor. The temperature compensation has been solved in the interval from 0 °C to 70 °C measuring currents from -10 A to +10 A.
authors.affiliation: Department of Electronic Engineering, University of Valencia, C/Doctor Moliner, 50, 46100-Burjassot, Spain. jaime.sanchez@uv.es
authors.forename: Jaime
authors.initials: J
authors.lastname: Sánchez Moreno
authors.forename: Diego
authors.initials: D
authors.lastname: Ramírez Muñoz
authors.forename: Susana
authors.initials: S
authors.lastname: Cardoso
authors.forename: Silvia
authors.initials: S
authors.lastname: Casans Berga
authors.forename: Asunción Edith
authors.initials: AE
authors.lastname: Navarro Antón
authors.forename: Paulo Jorge
authors.initials: PJ
authors.lastname: Peixeiro de Freitas
mesh_terms: D017097:Electric Impedance; D004867:Equipment Design; D008280:Magnetics / Q000295:instrumentation* / Q000379:methods*; D012428:Ruthenium / Q000737:chemistry; D013696:Temperature
chemical_list: D012428:Ruthenium