使用离散相位调节的数字锁相环路,现在成为一种很有兴趣的环路,它的稳态和暂态特性能够在白噪声附加出现时决定出来。本文对这种环路的分析方法作了叙述。文中叙述了一种“序列滤波器”它非常适用于本文所说的“数字锁相环路”。这种“序列滤波器”的运用,具有如下的特点:(1)相当于每个输出时的“输入个数”是个变数,而且输出决定于输入的序列;(2)使用了粗的分层(coarse quantization)。在本文中讨论了两个特殊的例题。闭合环路的暂态分析表明:这些环路具有转换速度限制的相位调整,说明这环路是非线性的。一个数字环路的“准带宽”(quasi—bandwidth)量度是借助于这个暂态响应来定义的。这个定义允许数字环路之间作比较,这个比较是在环路带宽内,在同等的信号噪声比的基础上进行的。在有限的延伸范围内,这个定义也使数字环路和线性环路相相似比较成为可能。数字环路的运用,发现与一阶线性锁相环路模型(在低环路带宽信噪比的情况下)相似,但由于相位调整到高信噪比的分层,数字环路的运用达到了一个最小的(但是有限的),相位误差。然而,只要选择足够的相位改正量,这个极限能够调整到所需要的小值。数字环路带宽,发现依照“信号能量对噪声的频谱密度”的比值而变化,而不是如线性模拟模型那样依照信号幅度而变? A digital phase locked loop using discrete phase adjustment is now an interesting loop whose steady-state and transient characteristics can be determined when white noise appearing. This paper describes the analysis of this loop. This article describes a “sequence filter” which is well suited to the “digital phase-locked loop” described in this article. The use of this “sequence filter” has the following characteristics: (1) The “input number” corresponding to each output is a variable and the output depends on the input sequence; (2) the coarse hierarchical (coarse quantization). Two specific examples are discussed in this article. Transient analysis of closed loops shows that these loops have a phase adjustment of the slew rate limit, indicating that the loop is non-linear. The “quasi-bandwidth” measure of a digital loop is defined by means of this transient response. This definition allows comparison between digital loops, which is based on the same signal-to-noise ratio within the loop bandwidth. Within a limited extension, this definition also makes it possible to compare digital loops and linear loops in a similar manner. The use of digital loops was found to be similar to first-order linear phase-locked loop models (with low loop-bandwidth signal-to-noise ratios), but due to the phase adjustment to high signal-to-noise ratio stratification, A minimal (but limited), phase error. However, this limit can be adjusted to the required small value as long as sufficient phase correction is selected. Digital loop bandwidth, found in accordance with the “signal energy to noise spectral density,” the ratio of change, rather than the linear analog model, as the signal amplitude and change?