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The Things to Know Regarding the Crystal Oscillator You have to understand that the crystal oscillator is a type of electronic oscillator which uses crystal as a frequency selective element to have inverse piezoelectric effect. This utilizes mechanical quality of the vibrating crystal having piezoelectric properties to get such electric signal possessing high-precision frequency. Be aware that the crystal oscillators are superior to those ceramic resonators due to the reason that they have lower cost, higher quality, stability and they are also smaller in their size. In crystal oscillators, the electrical resonant circuit is replaced with a mechanically vibrating crystal. The crystal has high degree of stability to be able to hold constant at any frequency that the crystal is cut in order to work. The crystal oscillators are utilized when great stability is required for example in the communication transmitters, the receivers, the digital clocks and several others. The quartz crystal would exhibit a really important property that is called piezo-electric effect. If there is mechanical pressure being applied across the faces of the crystal, then there is voltage which is proportional to the applied mechanical pressure and this 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 changing voltage being applied to the crystal would result it to vibrate to a normal frequency. Apart from the quartz, there are other substances that show the piezo-electric effect including tourmaline and Rochelle salt.
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The crystal oscillators are the main example of the oscillators with fixed frequency in which accuracy as well as stability are the very essential considerations. They would usually make use of the same circuits like the other types of oscillators with the difference wherein the crystal replaces the tuned circuit. In crystal oscillators, a crystal would vibrate when the resonator and also the resulting frequency would determine the oscillation’s frequency. 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 which are used in the crystal oscillators just exhibit very low phrase noise. These are utilized primarily in the digital integrated circuits because of having a stable clock signal as well as certain applications which require high-frequency reference.