Low offset vertical Hall device and current spinning method

A vertical Hall-effect sensor system disposed on a semiconductor substrate, comprising:

• a first conductive Hall-effect region arranged beneath a surface of the semiconductor substrate;
• at least two supply terminals arranged to supply electrical energy to the first Hall-effect region;
• at least one Hall signal terminal arranged to provide a first Hall signal from the first Hall-effect region, the first Hall signal being indicative of a magnetic field which is parallel to the surface of the semiconductor substrate and which acts on the first Hall-effect region;
• wherein one or more of the at least two supply terminals or one or more of the at least one Hall signal terminal comprises a force contact and a sense contact;
• and
• a feedback control circuit comprising:
• an output connected to the force contact and having a first impedance,
• an input connected to the sense contact and having a second impedance, the second impedance being higher than the first impedance, and
• a feedback loop to adjust a potential on the output of the feedback control circuit until a potential on the input of the feedback control circuit is equal to a reference potential.