A distributed interpolative sigma-delta interface for fluxgate sensor

被引：2

作者：

Dong, Changchun ^{[1
]}

Chen, Yanbo ^{[2
]}

Jiang, Zhanpeng ^{[3
]}

Ren, Mingyuan ^{[3
]}

Lu, Xuebin ^{[3
]}

Han, Xiaowei ^{[4
]}

机构：

[1] Jinhua Adv Res Inst, Jinhua 321000, Zhejiang, Peoples R China

[2] Shenzhen Polytech, ETI Ctr, Shenzhen 518055, Peoples R China

[3] Harbin Univ Sci & Technol, Sch Software & Microelect, Harbin, Peoples R China

[4] Harbin Univ Commerce, Sch Comp & Informat Engn, Harbin 150028, Peoples R China

来源：

MODERN PHYSICS LETTERS B | 2021年 / 35卷 / 07期

关键词：

Fluxgate; distributed interpolative sigma-delta; interface; MODULATOR;

D O I：

10.1142/S0217984921501311

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

This paper presents a sigma-delta interface for fluxgate sensor based on a single-loop high-order modulation. A feedforward summation loop structure can reduce the linearity overload in integrators and the swing of integration signals. A Local feedback branch is proposed to realize the zero of noise transfer function (NTF) optimization and enhance noise shaping performance within signal band. The interface is fabricated in a standard 0.5 mu m CMOS process and the active circuit area is about 13 mm(2). The chip consumes 120 mW from a 10 V supply with a sampling clock of 250 k Hz. The average noise floor of the digital fluxgate is about -115 dBV/Hz1/2 over a 100 Hz bandwidth.

引用

页数：13

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