模拟锁相陶瓷介质振荡器技术

Analog phase-locked ceramic resonator oscillators

摘要:

通过对模拟锁相频率源及传统方法实现的锁相频率源进行简要的分析比较，在分析取样鉴相器工作原理的基础上给出了模拟锁相CRO的具体实现方案。重点介绍了环路滤波电路及自动捕获电路的工作原理及参数设置，同时也给出了改进输出信号杂波抑制的方法。设计所得到的模拟锁相CRO，其相位噪声指标是采用一般的锁相方式难以获得的。实测表明模拟锁相CRO的相位噪声较低，输出频率3 GHz，相位噪声可以达到≤–115 dBc/Hz@10 kHz，杂波抑制指标也有一定的优势，可以达到优于–70 dBc。

Abstract:

This study researched and analyzed the analog phase-locked Ceramic Resonator Oscillators(CRO) technology based on low-phase noise，high-clutter suppression techniques. The analog phase-locked frequency source and the phase-locked frequency source implemented by traditional methods，were compared and analyzed. Based on the analysis of the working principle of sampling phase detector，an implementation scheme for the analog phase-locked CRO was proposed. Highlighting the operating principle and parameters setting of loop filter circuit and the auto-capture circuit，a method was given to improve the output signal spurious suppression. The phase noise indicators of the designed analog phase-locked CRO，were difficult to be obtained using general phase-locked methods. The practical test result of the proposed scheme indicated that the phase noise of analog phase-locked CRO was very low(with output frequency of 3 GHz，the phase noise could be less than or equal to -115 dBc/Hz@10 kHz)，and the spurious suppression index also showed certain advantages(could be better than -70 dBc).