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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 would use mechanical tone of vibrating crystal that comes with piezoelectric properties to have an electric signal which comes with 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 the crystal oscillators, the usual electrical resonant circuit is being replaced by 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. Quartz crystal would exhibit such very important property which is known as 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. When the voltage is applied to the crystal surfaces, the crystal becomes distorted with the amount proportional to the applied voltage. The changing voltage being applied to the crystal would result it to vibrate to a normal frequency. Other than the quartz, there are several other substances that would show piezo-electric effect and they are Rochelle salt and tourmaline.
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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 often use the same circuits like the other kinds of oscillators with the difference in which 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. This means that the crystal acts similar to the circuit with an inductor, a resistor and also capacitor having accurate 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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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 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 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.