Quartz crystal resonator equivalent circuit

Published:2011/7/4 20:47:00 Author:Christina | Keyword: Quartz crystal, resonator, equivalent circuit | From:SeekIC

The quartz crystal resonator equivalent circuit and the characteristic curve are as shown in figure 1. In the equivalent circuit, C0 is the capacitance between the two electrodes when the quartz crystal is working, it is called the electrostatic capacitive. The L and C are the equivalent parameters when the quartz crystal is resonating, R is the equivalent resistance, it represents the friction loss when the quartz crystal is oscillating, its value is about 100 Ω. Figure 1 The quartz crystal resonator equivalent circuit and the characteristic curve From the quartz crystal reactance - frequency characteristic curve we can see, the quartz crystal has two inherent frequencies, one is the L, C series resonance frequency f0, another is the L, C, Co parallel resonant frequency f∞. Because the Co is one hundred times larger than C, so the frequency of it is decided by the L, C parameters.



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