Integrated solutions to decrease micro-fluxgate sensors noise

Microfluxgate sensors are intended for the measurement of the very small variations of the earth magnetic field. Our sensors would present an output signal with a basic noise of about 1 nanotesla (nT)//spl radic/Hz, if an additional noise in the form of instabilities didn't regularly occur, increasing the output noise by regular jumps of 100 nT in the output signal. Some solutions are presented here to reduce and finally to suppress this problematic noise.