Phase-Locked Loop Design is a concise guide to both the theory and design of phase-locked loop circuits. It is written from an engineering point of view, with numerous illustrations, block diagrams, example circuits and experimental results - many based on the author's personal experience - and use of engineering analytical methods, such as signal flow graphs and Laplace transforms. Potential pit-falls in PLL design are avoided by a rigorous theoretical approach, with almost all results derived from first principles, although maths is used for practical relevance rather than academic interest. This has resulted in a substantially self-contained text, which should prove valuable both to the practising engineering in PLL design as well as those with an electronic engineering background, but less familiar with the subject.