Patent ID: 7250759

Claim:
An integrated circuit ( 10 ) for noise removal in a magnetic nano-particle sensor device, the integrated circuit comprising: at least one first magnetic field generator ( 11 ) and at least one magneto-resistive sensor ( 12 ), said at least one first magnetic field generator ( 11 ) being suitable for generating a first magnetic field component ( 22 ) in a sensitive direction of the at least one magneto-resistive sensor ( 12 ), means for determining an operation point of the at least one magneto-resistive sensor ( 12 ), there being a second magnetic field generator for generating a magnetic field for magnetising the nano-particles ( 20 ) to thereby generate a second magnetic field component ( 26 ) in the sensitive direction of the at least one magneto-resistive sensor ( 12 ) the integrated circuit furthermore comprising at least one noise optimisation circuit ( 13 ) adapted for stabilising the net magnetic field strength in the sensor ( 12 ) by compensating for said second magnetic field component ( 26 ).