Digital Closed Loop Analysis

Abstract

With the sampled transform techniques presented in Chapter 5, we can compute the transfer functions for Figure 5.1, which is reproduced for convenience in Figure 6.1. In this phase-locked loop, the analog mixer has been replaced with a phase detector having a sampler with a zero order hold. Recall the sampling phase detector may be for implementation convenience, or it may be necessary to process sampled signals. (As an example, a radar pulse might have a duration of only nanoseconds.)