基于边沿效应的压缩晶体谐振带宽的方法研究
发布时间：2019-05-22 20:36
【摘要】：传统的恒温晶体振荡器存在精度低、稳定度低、易老化等缺点。本文通过对普通恒温晶振进行分析研究,提出了以边沿效应模糊区为理论基础的压缩晶体谐振谱线带宽的方法,有效地解决了以上问题。从高分辨率的角度来看晶振的谐振频率不是一个点,而是一段区间,该方法的目的就是压缩这段区间,以提高晶振输出频率的精度。普通的晶体振荡器采用的是LC谐振器,而本论文设计的晶振中使用了两个晶振,一个用于选频,另一个用于稳频。晶振振荡起来后,通过调节选频晶振的谐振中心频率使两个晶振的谐振频率靠近,从而使这两个晶振谐振带宽的边沿处重叠,最终振荡电路振荡于这段重叠区域内,压缩了振荡范围,提高了精度。论文中设计了振荡电路、温度控制电路、测量振荡电路输出信号的方法。最终通过实验测量晶振的相噪,达到了减小相噪、提高精度的目的,证明了利用边沿效应可以压缩晶体的谐振带宽。
[Abstract]:The traditional constant temperature crystal oscillator has some shortcomings, such as low precision, low stability, easy aging and so on. In this paper, based on the analysis and study of ordinary constant temperature crystal oscillator, a method of compressed crystal resonance spectral line bandwidth based on the fuzzy region of edge effect is proposed, which effectively solves the above problems. From the point of view of high resolution, the resonance frequency of crystal oscillator is not a point, but an interval. The purpose of this method is to compress this interval in order to improve the accuracy of crystal oscillator output frequency. LC resonator is used in ordinary crystal oscillator, and two crystal oscillations are used in the crystal oscillator designed in this paper, one for frequency selection and the other for frequency stabilization. After the crystal oscillator swings up, the resonance frequency of the two crystal oscillations is close by adjusting the resonant center frequency of the frequency selected crystal oscillator, so that the edge of the resonance bandwidth of the two crystal oscillations overlaps, and finally the oscillatory circuit oscillates in this overlapping region. The range of oscillations is compressed and the accuracy is improved. In this paper, the oscillatory circuit, the temperature control circuit and the method of measuring the output signal of the oscillatory circuit are designed. Finally, the phase noise of crystal oscillator is measured by experiments, which reduces the phase noise and improves the precision. It is proved that the resonance bandwidth of crystal can be compressed by using edge effect.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN752
本文编号：2483241
[Abstract]:The traditional constant temperature crystal oscillator has some shortcomings, such as low precision, low stability, easy aging and so on. In this paper, based on the analysis and study of ordinary constant temperature crystal oscillator, a method of compressed crystal resonance spectral line bandwidth based on the fuzzy region of edge effect is proposed, which effectively solves the above problems. From the point of view of high resolution, the resonance frequency of crystal oscillator is not a point, but an interval. The purpose of this method is to compress this interval in order to improve the accuracy of crystal oscillator output frequency. LC resonator is used in ordinary crystal oscillator, and two crystal oscillations are used in the crystal oscillator designed in this paper, one for frequency selection and the other for frequency stabilization. After the crystal oscillator swings up, the resonance frequency of the two crystal oscillations is close by adjusting the resonant center frequency of the frequency selected crystal oscillator, so that the edge of the resonance bandwidth of the two crystal oscillations overlaps, and finally the oscillatory circuit oscillates in this overlapping region. The range of oscillations is compressed and the accuracy is improved. In this paper, the oscillatory circuit, the temperature control circuit and the method of measuring the output signal of the oscillatory circuit are designed. Finally, the phase noise of crystal oscillator is measured by experiments, which reduces the phase noise and improves the precision. It is proved that the resonance bandwidth of crystal can be compressed by using edge effect.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN752
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