A High Precision Digitally-Controlled Current Source for Magnetic-Field Measurements in Space

Mario Auer, Maximilian Scherzer

Research output: Chapter in Book/Report/Conference proceedingConference paper

Abstract

For spaceborne sensors power-efficient and lightweight circuitry is required, therefore, integrated solutions are preferred. In this paper an integrated current source is presented that can be used in the front-end of a fluxgate- magnetometer. A “radiation aware” design paradigm was followed to account for parameter shifts due to ionizing radiation and allow for radiation hardening without changing the topology.
The digital current source achieves a dynamic range of more than 19 bits. It is based on a Delta-Sigma modulator with a digital pulse-width modulator as a quantizer. The digital-to- analog conversion is performed using a current-steering cell that employs chopping to minimize flicker noise. A fully-differential amplifier is used to drive an improved Howland current source.
Index Terms—current source, precision, radiation hardness, Delta-Sigma
Original languageEnglish
Title of host publication 2019 IEEE 62nd International Midwest Symposium on Circuits and Systems (MWSCAS)
PublisherInstitute of Electrical and Electronics Engineers
Pages5-8
ISBN (Electronic)978-1-7281-2788-0
DOIs
Publication statusPublished - 2019
Event62nd IEEE International Midwest Symposium on Circuits and Systems
- Dallas, United States
Duration: 4 Aug 20197 Aug 2019

Conference

Conference62nd IEEE International Midwest Symposium on Circuits and Systems
Abbreviated titleMWSCAS
CountryUnited States
CityDallas
Period4/08/197/08/19

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