Design and Study of Temperature Compensated Crystal Oscillator Based on Low Phase Noise

Linliang Wang

doi:10.6911/WSRJ.202505_11(5).0011

Authors

Linliang Wang

DOI:

https://doi.org/10.6911/WSRJ.202505_11(5).0011

Keywords:

Temperature-compensated crystal oscillator; Low phase noise; Circuit design.

Abstract

In this paper, a temperature-compensated crystal oscillator (TCXO) design scheme based on low phase noise is proposed to address the problems of poor frequency stability and high phase noise of crystal oscillators under temperature change. By analyzing Leeson's phase noise model and the frequency-temperature characteristics of the crystal, the phase noise is reduced by optimizing the structure of the oscillator circuit, choosing a high-Q crystal resonator, selecting low-noise devices, and suppressing the power supply noise; at the same time, combining with the digital and analog hybrid compensation technology, the temperature sensor, polynomial voltage function generator and varactor diode are used to achieve accurate temperature compensation. The experimental results show that the designed TCXO has a phase noise of -160dBc/Hz at 10kHz offset and a temperature stability of ±0.5ppm (-40°C ~85°C), and the long-term reliability is verified by aging test. This study provides theoretical support and practical reference for the design and optimization of high-precision and low-noise crystal oscillators.

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References

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