Patent ID: 7323870

Claim:
A method of performing an on-wafer function test comprising: providing a wafer with a plurality of magnetic field sensor elements arranged thereon, wherein each magnetic field sensor element comprises a magnetic-field sensitive structure and an associated current conductor structure, wherein the magnetic-field-sensitive structure has a magnetic-field-dependent electrical characteristic, and wherein each of the current conductor structures is formed to generate a predetermined test magnetic field component in the associated magnetic-field-sensitive structure; testing each magnetic-field-sensitive structure of the magnetic field sensor elements by: generating a test signal through each of the current conductor structures, to generate the predetermined test magnetic field component in the associated magnetic-field-sensitive structure; sensing a change in the electrical characteristic of the magnetic-field-sensitive structure due to the test magnetic field component; and evaluating the functionality of the magnetic field sensor element, based on the sensed change in the electrical characteristic of the magnetic-field-sensitive structure.