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A Hybrid Magnetic Current Sensor With a Dual Differential DC Servo Loop Amirhoss
提出一种混合磁电流传感器，结合拾取线圈和霍尔板实现宽频带接触式电流测量。
0.18µm CMOS, 1.8V, 7.1mA, 43mA分辨率@5MHz带宽
混合磁传感器接触式电流测量双差分伺服环路霍尔板拾取线圈
▸采用双差分直流伺服环路（D3SL）抑制线圈路径偏移
▸通过拾取线圈和霍尔板分别检测高低频磁场
▸优化低通滤波器角频率实现噪声均衡
Abstract
This article presents a hybrid magnetic current
sensor for contactless current measurement. Pick-up coils and
Hall plates are employed to sense the high and low-frequency
fields, respectively, generated by a current-carrying conductor.
Due to the differentiating characteristic of the pick-up coils, a flat
frequency response can then be obtained by summing the outputs
of the coil and the Hall paths and passing the result through a
1st-order low-pass filter (LPF). For maximum resolution, the LPF
c