Design and implementation of low-phase-noise temperature-compensated crystal oscillator

Phase noise within the half-bandwidth of the loop is closely related to the loaded quality factor QL. The importance of loaded quality factor QL and the method to reduce phase noise on the basis of improving QL are introduced in this paper. STM32F103RCT6 MCU and AT-cut third-overtone 100-MHz quartz crystal resonator are used to achieve a 100-MHz low-phase-noise temperature compensated crystal oscillator prototype. After temperature compensation and reducing phase noise, the measured temperature performance of the 100-MHz low-phase-noise MTCXO are better than ±0.45 ppm/-30 °C-+50 °C, and measured phase noise results are better than -157 dBc/Hz at 1 kHz and -170 dBc/Hz at 10 kHz.

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