基于等效鉴相频率的新型相位噪声测量系统

提出了一种基于等效鉴相频率的新型相位噪声测量系统。利用频率信号间相位差周期性变化的规律,无需频率归一化便可完成相互间的线性相位比对。通过参差鉴相器获取相位差信息,经低通滤波及相关信号处理后得到参考源的压控信号,进而实现相位锁定并在锁定后提取被测信号的相位噪声信息送入频谱分析仪,从而实现了相位噪声的高精度测量。该系统可以用一个参考源完成任意频率信号的相位噪声测量,而且参考源的相位噪声低、频率稳定度高、压控范围宽。实验结果和分析表明了该系统设计的合理性和先进性,与传统相噪测量系统相比,具有测量精度高、电路结构简单和成本低的优点,具有广泛的应用和推广价值。

Novel phase noise measurement system base on equivalent phase comparison frequency

A novel phase noise measurement system is proposed base on equivalent phase comparison frequency. Using the regularity variation of the phase difference between frequency signals, linear phase comparison can be made without the normalization of the frequency signals. Phase difference information is achieved by irregular phase detector. The voltage control signal of reference source can be obtained after the information is processed by LPF and related signal circuits. Then phase lock can be realized, and the phase noise information of the measured signals can be extracted. The phase noise information is sent to a spectrum analyzer, thus high precision measurement of phase noise is realized. The system can measure phase noise between any frequency signals using high precision reference source of low phase noise in a wide voltage control. Experimental and analytical results show that the design of the system is rational and advanced. Compared with conventional phase noise measurement, the measurement precision of the proposed system is higher, its circuit structure is simpler and its cost is lower.