Read-out circuit in RT-fluxgate

The residence time fluxgate magnetometer approach is based on the characterization of the time spent by the core magnetization in each of the two stable equilibrium states of the potential function, that underpins the dynamic of a typical ferromagnetic core, when a (carefully configured) periodic excitation signal is applied. This time domain technique presents several interesting features and, in particular, it can be implemented by using bias signals having lower amplitude and frequency than those used in conventional fluxgate processing schemes. In this paper we present the RT-fluxgate magnetometer and the design of an analog-digital conditioning circuit for reading out the magnetic field information carried on spikes time position in the output waveform.