Microwave Circuit Design: A Practical Approach Using ADS

Chapter 11. Phase-Locked Loops

Chapter Outline

11.1 Introduction

11.2 Configuration and Operation of a PLL

11.3 PLL Components

11.4 Loop Filters

11.5 PLL Simulation in ADS

11.6 Summary

11.1 Introduction

The direct application of most microwave oscillators, previously described in Chapter 10, to a communication system is seldom possible because their phase noises are generally not low enough. The phase noise is associated with frequency jitters in the time domain. As the phase noise of the microwave oscillator is typically high, the frequency jitter also increases significantly with time. The large-frequency jitter prevents the direct use of the microwave oscillator in a communication system. In addition, the microwave oscillator’s phase or ...