Noise Characteristics and Measurement Methodology for Current Sensors

This technical report details the noise characteristics and measurement methodologies for tunnel magnetoresistance (TMR) and Hall-effect current sensors. It begins by outlining the importance of accurate current-sensing measurements in various electrical and power systems, emphasizing the distinct noise profiles of TMR and Hall-effect sensors. The report explains the fundamental sources of noise in magnetic sensors, including white noise and 1/f noise, and provides equations to characterize these noise types. It further describes the measurement methodology, including the setup and equipment used for accurate noise characterization across a wide frequency range. The report presents results from noise measurements performed in different configurations to validate the measurement system. It includes a comparison of noise performance between TMR and Hall-effect sensors, highlighting the superior noise performance of TMR technology. The findings are supported by graphical representations of noise spectral densities and time-domain waveforms, providing a comprehensive view of sensor performance.