From the concept of time-varying spectrum, a group general expressions of the jitter spectral densities are proposed, which are applicable to conditions of both arbitrary timing extraction (BPF or PLL, etc.) and arbitrary non-linear circuit (NLC).

• 由时变谱法概念,给出了在任意的提取方式(BPF或PLL等)及非线性电路(NLC)条件下,诸抖动功率谱的一般表达式。