本文分析了振荡器输出信号中相位噪声功率谱密度与等效噪声电压相对功率谱密度的关系。简捷地推导出了LC反馈振荡器相位噪声幂律谱的一般表示式,得到了各种相位噪声分量与振荡器电路参数之间的关系。所得到的全部结果给低噪声振荡器的设计、制作、频率稳定度的分析与相位噪声的测量提供了理论依据。 This paper analyzes the relationship between the phase noise power spectral density in the oscillator output signal and the relative power spectral density of the equivalent noise voltage. The general expression of the power-law spectrum of phase noise of LC feedback oscillator is simply deduced, and the relationship between various phase noise components and oscillator circuit parameters is obtained. All the results obtained provide a theoretical basis for the design and fabrication of low noise oscillator, the analysis of frequency stability and the measurement of phase noise.