From the equivalent circuit of quartz crystal resonator, it can be known that it has two resonant frequencies, that is, when a, L, C and R branches occur in series resonance, its equivalent impedance is the minimum (equal to R).

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Quartz crystal oscillator, short for quartz crystal resonator, is the core product of quartz crystal components. It is a resonant device made by using the principle that the resonance phenomenon is caused by piezoelectric effect