Shunt current measurements are widely used for monitoring and controlling the current flow in various applications, such as power converters and battery management systems (BMS). The accuracy and resolution of this kind of measurements depend on the performance of the sample-and-hold (S/H) circuit that captures the voltage across a shunt resistor. In this paper, we propose a noise analysis of a S/H circuit that operates in accumulation mode; this technique enables to lower the thermal noise by 3 dB for every doubling of the number of accumulation cycles. The proposed analysis, confirmed by extensive simulation results, demonstrates that this approach offers a lower noise power spectral density and a higher signal-to-noise ratio if compared with conventional amplification-based S/H solutions.
Thermal Noise Analysis of Accumulation-based S/H Circuit for Shunt Current Sensing
Yarragunta J. S.;Aprile A.
;Bonizzoni E.;Malcovati P.
2023-01-01
Abstract
Shunt current measurements are widely used for monitoring and controlling the current flow in various applications, such as power converters and battery management systems (BMS). The accuracy and resolution of this kind of measurements depend on the performance of the sample-and-hold (S/H) circuit that captures the voltage across a shunt resistor. In this paper, we propose a noise analysis of a S/H circuit that operates in accumulation mode; this technique enables to lower the thermal noise by 3 dB for every doubling of the number of accumulation cycles. The proposed analysis, confirmed by extensive simulation results, demonstrates that this approach offers a lower noise power spectral density and a higher signal-to-noise ratio if compared with conventional amplification-based S/H solutions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
