The Different Things You Must Know About 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. 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 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. Therefore, the crystal oscillators are used whenever great stability is required for instance in the communication transmitters, the receivers, the digital clocks and 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. 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 crystal oscillators, a crystal would vibrate when the resonator and also the resulting frequency would determine the oscillation’s frequency. This means that the crystals are going to act the same with the circuit that comes with inductor, resistor and capacitor that has accurate resonant frequency. To have much better thermal stability for the crystal oscillator, there is a temperature compensation being applied.
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You must know that there are so many benefits when crystal oscillators are being 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.
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