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What You Should Know About Crystal Oscillators 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 uses the mechanical resonance of those vibrating crystal that has piezoelectric characteristics to get an electric signal that comes with 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. Know that the crystal has a high degree of stability to hold constant at whatever frequency the crystal is cut 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. If there is mechanical pressure applied across the faces of the crystal, there is a voltage that is proportional to the applied mechanical pressure that 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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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 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. This means that the crystal acts similar to the circuit with an inductor, a resistor and also capacitor having accurate resonant frequency. To have much better thermal stability for the crystal oscillator, there is a temperature compensation being 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 made to have better range of specific frequencies. Compared to tuned circuits, the crystals would have a high Q-factor, better frequency stability and temperature stability unlike the RC oscillators or those 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.

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