宽带数据采集系统的相位噪声分析

研究了宽带数据采集系统的相位噪声、信号频率和信噪比之间的关系。根据相位噪声的计算模型,推导出多载频信号和宽带信号相位抖动信噪比的计算方法,通过噪声的频谱可以看出,独立时钟相位的抖动噪声是均匀分布在整个采样频谱中的,过采样和滤波可有效改善其信噪比。理论结果表明线性调频信号的相位噪声可用宽带信号的模型计算,当信号的带宽较小时,完全可由单频信号的计算公式得出近似的结果。最后,仿真结果验证了该SNR算法的有效性。

Analysis of Phase Noise in Wideband Data Acquisition System

The relations among the phase noise,signal frequency,and SNR of wideband data acquisition system are investigated from a practical perspective.Based on the jitter theory,the calculation model of phase noise was found,and the expressions for the SNRs on phase noise of wideband signal and multicarrier signal are derived.Since the mean error power of independent phase noise is uniformly distributed over the whole sampling spectrum,the SNR in a given frequency band can be improved by the oversampling technique....