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A Wide-Band Magnetoelectric Sensor Based on a Negative-Feedback Compensated Readout Circuit
Yang Qiu1, Lingshan Shi1, Longyu Chen1
1The Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province, College of Information Engineering, China Jiliang University, Hangzhou 310018, China.
Sensors (Basel, Switzerland)
|January 23, 2024
Summary
This study introduces a novel negative-feedback readout circuit to significantly enhance the bandwidth of magnetoelectric (ME) sensors. This advancement enables more effective detection of broadband weak magnetic signals for various applications.
Area of Science:
- Materials Science
- Electrical Engineering
- Sensor Technology
Background:
- Magnetoelectric (ME) sensors suffer from narrow bandwidth, limiting their ability to detect broadband magnetic fields.
- Existing readout circuits lack the flexibility to adjust sensor bandwidth, hindering wider applications.
Purpose of the Study:
- To develop and validate a negative-feedback readout circuit for expanding the operational bandwidth of ME sensors.
- To improve the stability and applicability of ME sensors in broadband weak magnetic signal detection.
Main Methods:
- Fabrication of a Metglas/PVDF/Metglas ME sensor.
- Introduction of a negative-feedback compensation circuit, including a current amplifier, feedback resistor, and feedback coil, integrated with a direct readout circuit.
- Experimental measurement of ME voltage coefficients and noise levels across different frequency bands.
Main Results:
- The negative-feedback circuit stabilized the ME voltage coefficient to 900 V/T across the 6-39 kHz band, overcoming a six-fold variation in uncompensated sensors.
- The readout circuit did not increase the sensor's equivalent magnetic noise, maintaining levels of 240-620 pT/√Hz.
- Significant bandwidth expansion was achieved for the ME sensor.
Conclusions:
- The proposed negative-feedback readout circuit effectively broadens the bandwidth of ME sensors.
- This technology is promising for applications requiring broadband weak magnetic signal detection, such as DBS electrode positioning.
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