Abstract
This article presents a model that allows deriving the stability conditions of a newly developed digital high sensitivity giant magneto-impedance (GMI) magnetometer as a function of the time delay, induced by digital processing, and of the sensitivity. The description of the developed digital magnetometer is given. The transfer function of each involved stage as well as the whole transfer function of the direct open-loop chain were derived. The analysis of the stability was performed by calculating the gain and the phase margins of this transfer function in the Black–Nickols diagram. The experimental results were in good agreement with the modeling and showed that, with a tradeoff between the time delay and the sensitivity, the stability of the magnetometer can be guaranteed.
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