Crystal oscillators are oscillators where the primary frequency
determining element is a quartz crystal. Because of the inherent
characteristics of the quartz crystal the crystal oscillator may be
held to extreme accuracy of frequency stability. Temperature
compensation may be applied to crystal oscillators to improve thermal
stability of the crystal oscillator.Oven Controlled Crystal Oscillators
are the best of crystal oscillators,which is high stability and low
noise.Usually OCXOs are used in numerical apllications,such as cellure
base station,telecom,satcom,and scientific R&D.
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