Abstract
In order to solve the unstable problem of conventional methods for measuring resonant frequency of quartz crystal, a method based on DDS (Direct Digital Synthesis) and real-time peak searching is proposed to increase stability of measurement. By actively generating excitation signal using DDS, the response of quartz crystal can be obtained even under heavy load. Frequency response of impedance is studied to reveal the relationship between minimum impedance and resonant frequency. Electric circuit and real-time searching algorithm is designed to track resonant frequency of quartz crystal. Experimental results show when parameter of quartz crystal changes 392.0%, the resonant frequency could still be measured by the developed method.
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