数字直放站锁相源的杂散问题解决方案

Spurious Emissions Solution Plans Of Phase-Locked Source in digital repeater

数字直放站采用数字中频处理技术方式并通过光纤实现远距离信号传输,此对系统中的锁相源的相位噪声提出了很高的要求。小数分频锁相源相对整数分频锁相源的最大优势就是相位噪声性能好,能满足系统的要求。但是,由此而导致其他一些指标性能的下降,如杂散问题即是其中比较突出的难点之一,此文即是在此基础上提出了解决数字直放站锁相源杂散问题的一些方法。

In digital repeater, the application of digital intermediate frequency technology and realization of optical fiber transmission for distance will require for little Phase Noise of Phase-Locked Source. Compare to Integral Frequency, the virtue of Fractional-N Frequency is little Phase Noise. But that will debase other capabilities,for example the spurious emissions is just one of the diffi-cuties. This article introduces some methods of spurious emissions Analysis.