Implementation of a Fully Differential Low Noise Current Source for Fluxgate Sensors

Maximilian Scherzer; Mario Auer; Aris Valavanoglou; Werner Magnes

doi:10.1109/lascas53948.2022.9789061

Implementation of a Fully Differential Low Noise Current Source for Fluxgate Sensors

Research output: Chapter in Book/Report/Conference proceeding › Conference paper › peer-review

Abstract

In this paper the implementation of a fully differ-ential low-noise current source is presented. It was designed to be used in the feedback path of a fluxgate magnetometer, however, the concept is applicable wherever a low noise and precise current is required. The current source is driven by a transimpedance amplifier that buffers the output of a current-steering DAC. To meet the mandatory precision as well as the required noise level a detailed analysis of the proposed circuit was carried out. The complete feedback path is integrated on chip using a 180 nm CMOS technology and occupies a total area of 2 mm2. The proposed design results in a signal-to-noise ratio of more than 104 dB for a bandwidth of 512 Hz, requiring only a supply voltage of 3.3 V. Moreover the current source is capable of driving currents of more than 18 mA into fluxgate sensors with an inductance of up to 9 mH while consuming 70 mW of power. To the best of the authors' knowledge the designed current source offers the best performance in terms of noise for fluxgate sensor front ends.

Original language	English
Title of host publication	2022 IEEE 13th Latin America Symposium on Circuits and System (LASCAS)
ISBN (Electronic)	978-1-6654-2008-2
DOIs	https://doi.org/10.1109/lascas53948.2022.9789061
Publication status	Published - 4 Mar 2022
Event	13th Latin American Symposium on Circuits and Systems: LASCAS 2022 - Santiago, Chile Duration: 1 Mar 2022 → 4 Mar 2022 https://ieee-lascas.org/

Conference

Conference	13th Latin American Symposium on Circuits and Systems
Abbreviated title	LASCAS 2022
Country/Territory	Chile
City	Santiago
Period	1/03/22 → 4/03/22
Internet address	https://ieee-lascas.org/

Keywords

Current Source
Fluxgate Sensor
Fully Differential
Low Noise
Space Applications

ASJC Scopus subject areas

Safety, Risk, Reliability and Quality
Electrical and Electronic Engineering
Hardware and Architecture

Access to Document

10.1109/lascas53948.2022.9789061

Cite this

@inproceedings{599f31a9b4ea473783b1488df29504d9,

title = "Implementation of a Fully Differential Low Noise Current Source for Fluxgate Sensors",

abstract = "In this paper the implementation of a fully differ-ential low-noise current source is presented. It was designed to be used in the feedback path of a fluxgate magnetometer, however, the concept is applicable wherever a low noise and precise current is required. The current source is driven by a transimpedance amplifier that buffers the output of a current-steering DAC. To meet the mandatory precision as well as the required noise level a detailed analysis of the proposed circuit was carried out. The complete feedback path is integrated on chip using a 180 nm CMOS technology and occupies a total area of 2 mm2. The proposed design results in a signal-to-noise ratio of more than 104 dB for a bandwidth of 512 Hz, requiring only a supply voltage of 3.3 V. Moreover the current source is capable of driving currents of more than 18 mA into fluxgate sensors with an inductance of up to 9 mH while consuming 70 mW of power. To the best of the authors' knowledge the designed current source offers the best performance in terms of noise for fluxgate sensor front ends.",

keywords = "Current Source, Fluxgate Sensor, Fully Differential, Low Noise, Space Applications",

author = "Maximilian Scherzer and Mario Auer and Aris Valavanoglou and Werner Magnes",

year = "2022",

month = mar,

day = "4",

doi = "10.1109/lascas53948.2022.9789061",

language = "English",

booktitle = "2022 IEEE 13th Latin America Symposium on Circuits and System (LASCAS)",

note = "13th Latin American Symposium on Circuits and Systems : LASCAS 2022, LASCAS 2022 ; Conference date: 01-03-2022 Through 04-03-2022",

url = "https://ieee-lascas.org/",

}

TY - GEN

T1 - Implementation of a Fully Differential Low Noise Current Source for Fluxgate Sensors

AU - Scherzer, Maximilian

AU - Auer, Mario

AU - Valavanoglou, Aris

AU - Magnes, Werner

PY - 2022/3/4

Y1 - 2022/3/4

N2 - In this paper the implementation of a fully differ-ential low-noise current source is presented. It was designed to be used in the feedback path of a fluxgate magnetometer, however, the concept is applicable wherever a low noise and precise current is required. The current source is driven by a transimpedance amplifier that buffers the output of a current-steering DAC. To meet the mandatory precision as well as the required noise level a detailed analysis of the proposed circuit was carried out. The complete feedback path is integrated on chip using a 180 nm CMOS technology and occupies a total area of 2 mm2. The proposed design results in a signal-to-noise ratio of more than 104 dB for a bandwidth of 512 Hz, requiring only a supply voltage of 3.3 V. Moreover the current source is capable of driving currents of more than 18 mA into fluxgate sensors with an inductance of up to 9 mH while consuming 70 mW of power. To the best of the authors' knowledge the designed current source offers the best performance in terms of noise for fluxgate sensor front ends.

AB - In this paper the implementation of a fully differ-ential low-noise current source is presented. It was designed to be used in the feedback path of a fluxgate magnetometer, however, the concept is applicable wherever a low noise and precise current is required. The current source is driven by a transimpedance amplifier that buffers the output of a current-steering DAC. To meet the mandatory precision as well as the required noise level a detailed analysis of the proposed circuit was carried out. The complete feedback path is integrated on chip using a 180 nm CMOS technology and occupies a total area of 2 mm2. The proposed design results in a signal-to-noise ratio of more than 104 dB for a bandwidth of 512 Hz, requiring only a supply voltage of 3.3 V. Moreover the current source is capable of driving currents of more than 18 mA into fluxgate sensors with an inductance of up to 9 mH while consuming 70 mW of power. To the best of the authors' knowledge the designed current source offers the best performance in terms of noise for fluxgate sensor front ends.

KW - Current Source

KW - Fluxgate Sensor

KW - Fully Differential

KW - Low Noise

KW - Space Applications

UR - https://www.scopus.com/pages/publications/85133192927

U2 - 10.1109/lascas53948.2022.9789061

DO - 10.1109/lascas53948.2022.9789061

M3 - Conference paper

BT - 2022 IEEE 13th Latin America Symposium on Circuits and System (LASCAS)

T2 - 13th Latin American Symposium on Circuits and Systems

Y2 - 1 March 2022 through 4 March 2022

ER -

Implementation of a Fully Differential Low Noise Current Source for Fluxgate Sensors

Abstract

Conference

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint