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For improving the frequency-temperature characteristic of temperature compensation overtone crystal oscillator (TCOXO), a novel 120MHz TCOXO design is described in this paper. It is different from general methods, in which a compensated 40MHz 3th overtone crystal oscillator is frequency tripled. This design utilizes a 100MHz AT-cut 5th overtone crystal oscillator mixing with a 20MHz AT-cut VCXO, then...
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