Journal
SENSORS
Volume 10, Issue 4, Pages 3954-3960Publisher
MOLECULAR DIVERSITY PRESERVATION INTERNATIONAL-MDPI
DOI: 10.3390/s100403954
Keywords
quartz crystal; magnetic pulling; parasitic capacitance compensation
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Generally, quartz crystal inductance frequency pulling in oscillators is very low and therefore is not often used in practice. The new method of improving frequency pullability uses inductance to compensate for quartz stray capacitances. To this end, a special AT fundamental quartz crystal working near the antiresonance frequency is selected. By modifying its equivalent circuit with load inductance and series tuning capacitance, the magnetic sensing of the circuit can be highly improved. The experimental results show that the new approach using the quartz crystal stray capacitance compensation method increases the frequency pulling range (from congruent to 2 kHz/mu H to congruent to 600 kHz/mu H) by x 300 depending on the type of oscillator, making possible the measurement of nano-magnetic changes.
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