PLL Performance, Simulation and Design, Fourth Edition

I first became familiar with PLLs by working for National Semiconductor as an applications engineer. While supporting customers, I noticed that there were many repeat questions. Instead of creating the same response over and over, it made more sense to create a document, worksheet, or program to address these recurring questions in greater detail and just re-send the file. From all of these documents, worksheets, and programs, this book was born.

Many questions concerning PLLs can be answered through a greater understanding of the problem and the mathematics involved. By approaching problems in a rigorous mathematical way one gains a greater level of understanding, a greater level of satisfaction, and the ability to apply the concepts learned to other problems.

Many of the formulas that are commonly used for PLL design and simulation contain gross approximations with no or little justification of how they were derived. Others are rigorously derived, but from outdated textbooks that make assumptions not true of the PLL systems today. It is therefore no surprise that there areso many rules of thumb to be born which yield unreliable results. Another fault of these formulas is that many of them have not been compared to measured data to ensure that they account for all relevant factors.

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