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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 would use mechanical tone of vibrating crystal that comes with piezoelectric properties to have an electric signal which comes with high-precision frequency. Know that the crystal oscillators are actually considered superior to the ceramic resonators since they have higher stability, lower cost, higher quality and 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. Hence, the crystal oscillators are being used if great stability is needed for instance in the communication transmitters, digital clocks, the receivers as well as others. Quartz crystal would exhibit such very important property which is known as 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. When the voltage is applied to the crystal surfaces, the crystal becomes distorted with the amount proportional to the applied voltage. The changing voltage applied to the crystal results it to vibrate at a natural 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 primary example of those fixed-frequency oscillators in which the accuracy and the stability are quite important 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. With the crystal oscillators, the crystal is going to vibrate when the resonator and its resulting frequency is what determines the frequency of such 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. In some instances, in order to have a better thermal stability for the crystal oscillator, a temperature compensation is applied.
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Be aware that there are various benefits when crystal oscillators are actually used in the digital applications. The crystals may be manufactured to have a wide range of specific frequencies. Unlike those tuned circuits, the crystal have a high Q-factors, better temperature stability, better frequency stability as compared to the RC and the LC oscillators. The crystals that are utilized in the crystal oscillators have 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.