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High resolution switching mode inductance-to-frequency converter with temperature compensation
1Institute for Automation, Faculty of Electrical Engineering and Computer Science, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia. vojko.matko@um.si.
Sensors (Basel, Switzerland)
|October 18, 2014
Summary
This study introduces a novel switching oscillator method to stabilize inductance-to-frequency converters. The technique significantly reduces temperature effects on quartz crystals, enabling high-resolution inductance measurements.
Area of Science:
- Electrical Engineering
- Physics
- Metrology
Background:
- Quartz crystals exhibit temperature-dependent frequency drift, impacting precision measurements.
- Inductance-to-frequency converters require high stability for accurate inductance sensing.
Purpose of the Study:
- To develop a novel temperature-compensated inductance-to-frequency converter.
- To enhance the temperature stability of quartz crystal oscillators in measurement circuits.
Main Methods:
- Utilized a switching-mode converter with a single quartz crystal.
- Incorporated parallel impedances and series inductances to the quartz crystal circuit.
- Implemented an oscillator switching method for active compensation.
Main Results:
- Achieved significant reduction in temperature influence on AT-cut crystal frequency (10-40 °C).
- Demonstrated theoretical resolution of 2 pH for inductance measurements.
- Enabled inductance-to-frequency conversion from 85-100 µH to 2-560 kHz.
Conclusions:
- The proposed switching method effectively compensates for quartz crystal temperature characteristics and aging.
- The technique enhances frequency sensitivity for inductance measurements.
- The novel approach offers a pathway to highly stable and precise inductance sensing.
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