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The Things to Know Regarding the Crystal Oscillator It is important for you to know that the crystal oscillator is one kind of electronic oscillator that utilizes crystal as a frequency selective element to get an inverse piezoelectric effect. This utilizes mechanical quality of the vibrating crystal having piezoelectric properties to get such electric signal possessing high-precision frequency. You must know that those crystal oscillators are known to be superior to the ceramic resonators because they have higher stability, quality, lower cost as well as they are smaller in size. In crystal oscillators, the electrical resonant circuit is replaced with a mechanically vibrating crystal. The crystal comes with high degree of stability in order to hold constant at any frequency the crystal is cut in order to operate. Therefore, the crystal oscillators are used whenever great stability is required for instance in the communication transmitters, the receivers, the digital clocks and others. The quartz crystal would exhibit a really important property that is called piezo-electric effect. When there is mechanical pressure applied across the faces of the crystal, a voltage is proportional to the applied mechanical pressure which appears across the crystal. If the voltage is applied to the surfaces of the crystal, then the crystal becomes distorted with the amount that is proportional to the applied voltage. The alternating voltage being applied to the crystal would cause it to vibrate at a natural frequency. Aside from the quartz, other substances which show the piezo-electric effect include tourmaline and Rochelle salt.
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Crystal oscillators are the main example of the fixed-frequency oscillators wherein the accuracy and the stability are really major considerations. They are going to use the same circuits in which the other kinds of oscillators with such difference wherein the crystal would replace the tuned circuit. In the crystal oscillators, the crystal would vibrate when the resonator and the resulting frequency determines the frequency of oscillation. What this means that the crystals would act same with the circuit that comes with a resistor, inductor and capacitor with specific resonant frequency. To have much better thermal stability for the crystal oscillator, there is a temperature compensation being applied.
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Know that there are a lot of advantages when crystal oscillators are used in the digital applications. The crystals may be made to have better range of specific frequencies. Unlike the tuned circuits, the crystals possess a high Q-factor, a better temperature stability as well as better frequency stability as compared to the RC oscillators or the LC oscillators. The crystals that are utilized in the crystal oscillators have very low phrase noise. These are used primarily in the digital integrated circulates for giving a stable clock signal as well as in the specific applications that require high-frequency reference.