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. 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. 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. 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 alternating voltage being applied to the crystal would cause 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 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 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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Know that there are a lot of advantages when crystal oscillators are used in the digital applications. Crystals can be manufactured to have a great 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.