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A Hybrid Magnetic Current Sensor With a Multiplexed Ripple-Reduction Loop Amirho
一种混合磁电流传感器，结合霍尔板和线圈实现宽频带电流测量，并采用多路复用纹波抑制环路降低偏移。
0.18µm CMOS, 1.8V, 7.8mA, 4.6mm², 5MHz BW, ±2%增益变化, 1.6fW/Hz FoM
混合磁传感器霍尔板线圈纹波抑制温度补偿
▸霍尔板和线圈分别用于低频和高频磁场检测
▸采用温度相关增益电阻和PTAT电流补偿灵敏度漂移
▸多路复用纹波抑制环路（MMRL）降低霍尔板偏移
Abstract
This article presents a hybrid magnetic current
sensor for galvanically isolated measurements. It consists of a
CMOS chip that senses the magnetic field generated by current
flowing through a lead-frame-based current rail. Hall plates
and coils are used to sense low-frequency (dc to 10 kHz) and
high-frequency (10 kHz to 5 MHz) magnetic fields, respectively.
With the help of on-chip calibration coils, the biasing current
of the Hall plates is trimmed to match the sensitivity of the
Hall and coil