Dual Measurement of Current and Temperature Using a Single Tunneling Magnetoresistive Sensor

Xuyang Liu, Philip W.T. Pong, Chunhua Liu

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

4 Scopus citations


This paper presents a sensitive and high cost-effective dual-parameter measurement technique, which is capable of measuring current and temperature based on Johnson noise thermometry (JNT) with the single tunneling magnetoresistive (TMR) sensor. The key is to utilize a TMR sensor with high sensitivity of 250 mV/V/mT to measure the current as well as temperature. Also, an ultra-low noise preamplifier with the equivalent noise as 3.1 nV/√Hz (@ 1 kHz) and a precise 10 μA constant current source are designed to implement the JNT and current measurement. Furthermore, a high-speed FPGA combined with ADC modules is used to carry out the signal processing algorithm and finally to calculate out the parameters of current and temperature. Finally, the dual-parameter sensing is verified by measuring current in the range of ±10 A and temperature ranging from -40 °C to 160 °C, respectively.

Original languageEnglish (US)
Title of host publication2018 IEEE SENSORS, SENSORS 2018 - Conference Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538647073
StatePublished - Dec 26 2018
Externally publishedYes
Event17th IEEE SENSORS Conference, SENSORS 2018 - New Delhi, India
Duration: Oct 28 2018Oct 31 2018

Publication series

NameProceedings of IEEE Sensors
ISSN (Print)1930-0395
ISSN (Electronic)2168-9229


Conference17th IEEE SENSORS Conference, SENSORS 2018
CityNew Delhi

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


  • Dual-parameter sensor
  • Johnson noise thermometry
  • TMR sensor
  • Ultra-low noise preamplifier


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