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该论文提出一种混合磁电流传感器，采用双差分直流伺服环路，在5MHz带宽内实现51A量程和43mArms分辨率。通过优化斩波调制与自旋频率，解决了宽带宽高精度电流感测中的偏移与噪声问题。
Each quadrature component is chopper demodulated and then integrated via Rs3 (=10M&) and Cfsp (=5pF) to generate a correction signal that is upmodulated and fed back to A4 via an auxiliary input stage. The offset of A4 is suppressed similarly but with the chopper disabled. For a good tradeoff between residual offset and the low-pass filtering of residual spinning ripple, fsp = 25kHz was chosen. Magnetic current sensors are widely used in applications where galvanic isolation and wide bandwidth (BW) are desired, such as in switched-mode power supplies and motor drivers. By using Hall plates for low frequencies and pick-up coils for high frequencies, hybrid magnetic sensors can achieve high resolution (tens of mA) over a wide frequency range (up to 15MHz) [1-3]. However, previous designs exhibit either poor gain flatness
Amirhossein Jouyaeian1, Qinwen Fan1, Mario Motz2, Udo Ausserlechner2, Kofi A. A. Makinwa1
Delft University of Technology, Delft, The Netherlands Infineon Technologies, Villach, Austria offset of A4, which causes extra ripple at 2fsp