Magnetic-to-Digital Converters Using Single-Amplifier-Based Second-Order Delta-Sigma Modulators

Chien Hung Kuo, Shr Lung Chen, Shen Iuan Liu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this paper, two magnetic-to-digital converters (MDCs) using single-amplifler-based second-order delta-sigma modulators (DSMs) are presented to detect the dc magnetic field. The proposed second-order DSM required only a single-operational amplifier to achieve the second-order noise shaping. Both the proposed circuits have been fabricated in a 0.5-μm CMOS DPDM process, and the resolution of 11 bits can be achieved. The measured sensitivities are 1.486 and 0.459 mV/mT, and the minimum detectable magnetic fields are 0.6 mT and 0.4 mT for the MDC with and without the pre-amplifier, respectively. Both the measured nonlinearities are smaller than 1.3% within the range of ± 100 mT.

Original languageEnglish
Pages (from-to)226-231
Number of pages6
JournalIEEE Sensors Journal
Volume4
Issue number2
DOIs
Publication statusPublished - 2004 Apr 1

Keywords

  • CMOS
  • Delta-sigma modulator (DSM)
  • Magnetic sensor

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering

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