2007•Piezoelectrics and AcoustoopticsRequires access
A Novel 120 MHz Overtone Crystal Oscillator with Microprocessor Compensation
Feng Yuan Tan
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Abstract
A novel 120 MHz microprocessor temperature-compensated overtone crystal oscillator(MTCOXO),which is based on mixing,is presented.In this design,a 100 MHz 5th overtone crystal oscillator and a 20 MHz VCXO are mixed,and its products are filtered.Ultimately,the stable 120 MHz signal is obtained.The microprocessor is utilized to control VCXO in the system so that frequency deviations of the whole system are directly compensated by the VCXO,without the series inductor and frequency multiplication in the traditional high-frequency overtone temperature-compensated crystal oscillator.The MTCOXO can achieve the frequency-temperature stability of ±2.4×10-7 from-30 ℃ to +75 ℃.