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An Automatic Loop Gain Enhancement Technique in Magnetoimpedance-Based Magnetome
提出一种基于磁阻抗效应的磁力计，采用自动增益增强技术实现高带宽和低噪声。
0.18-µm CMOS, 8-pT/√Hz噪声基底, 31-kHz带宽, 96dB动态范围, 1.97mW功耗
磁阻抗磁力计开关电容相关双采样磁负反馈
▸数字校准方案自动增强系统环路增益
▸开关电容前端抑制放大器折叠噪声
▸单线圈磁负反馈架构结合CDS技术提高动态范围
Abstract
A low-power, low-noise, and high-bandwidth mag-
netometer that utilizes the magnetoimpedance (MI) element as a
sensor head is presented. The MI element has a high sensitivity,
and it can be implemented in the mm-scale through the MEMS
process. The analog front-end (AFE) circuit of the magnetometer
includes a digital calibration scheme that automatically enhances
the loop gain of the system, resulting in high bandwidth and
low-noise characteristics. The AFE circuit is designed based on
a switched