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分析了应用 Z 变换取样数据理论的局部数字化锁相环,求得这种环内各个结点于阶频率输入和对于正弦波频率输入的响应。这些响应和相应的模拟锁相环的响应进行了比较。确定了稳定度的判据和根轨跡。研究了量化的影响。推断出在宽范围内工作的数字式锁相环的性能和相应的模拟锁相环的性能相近,但是作为数字化还可能有某些优点。
The local digital phase-locked loop using the Z-transform sampled data theory is analyzed and the response of each node in the ring to the order frequency input and to the sine wave frequency input is obtained. These responses are compared with the corresponding analog phase-locked loop responses. The criterion of stability and root locus are determined. Studied the impact of quantization. It is deduced that the performance of a digital phase locked loop operating in a wide range is similar to that of a corresponding analog phase locked loop, but there may be some advantages as digitization.