Integrated microsystem for 3D magnetic field measurements

In this paper we present a portable battery-operated 3D magnetic microsyste m (magnetodosimeter), intended for monitoring the workers' exposure to magn etic fields, in particular, working environments such as hospitals or physi cs laboratories. The proposed microsystem is based on a multi-chip module c ontaining three equal channels for the three components of the magnetic fie ld measurement, a microprocessor and a memory. Each single-chip channel det ects the magnetic field, converts it into the digital domain and delivers t he result to the microprocessor by means of an on-chip serial interface. Th e single-chip channel, fabricated in a 0.8 mu m CMOS technology, is sensiti ve to magnetic fields ranging from -200 mT to +200 mT, achieving 12 bits of resolution and 11 bits of linearity.