Book: High-Speed Circuit Board Signal Integrity (Artech House Microwave Library)
Publisher: Artech House Publishers
This is a book for engineers designing high-speed circuit boards. To the signal integrityengineer, this book will be a handbook of formulas and terminology as well as arefresher of basic electrostatic and electromagnetic principals. The high-speed circuitdesigner will find this book an easy entry into the electromagnetics and physicsof high-speed signaling. It introduces concepts fundamental to high-speed signaling,such as lossy transmission line behavior, skin effect, and the characteristics of laminatesand surface mount capacitors. The focus throughout is on the effects of dielectricand conductor loss on signal quality, with a particular emphasis on serialdifferential signaling. Coupling between transmission lines (especially in the contextof crosstalk and odd/even modes) is discussed. Besides being useful in serial signaling,this has application to multiconductor busses.This is a book about high-speed signaling on printed wiring boards (PWBs). Thephysical construction of PWBs determines the conductor’s resistance (discussed inChapter 2), its self capacitance (covered in Chapter 3) and inductance (Chapter 4),and the coupling to neighboring conductors (Chapters 5 and 9). At the high frequenciesof interest in this book, these electrical primitives appear on a PWB as distributedrather than lumped elements, giving rise to transmission line behavior.It is thus necessary for the high-speed circuit designer to have an understandingof how PWBs are constructed and a sense of the trade-offs fabricators must makewhen manufacturing high-density, high-layer count PWBs. This chapter summarizesthose characteristics impacting the electrical characteristics of PWBs and introducessome of the terminology used in the PWB design industry.The larger PWB fabricators provide design for manufacturability (DFM) documents(see [1, 2] to cite just two examples) that detail the dimensional and many ofthe practical requirements necessary to create PWB artwork for their facility. Thesedocuments are helpful in understanding the practical state of the art in such thingsas via size, layer count, and trace width and spacing and can act as a primer to thoseunfamiliar with PWB technology. Additional underlying detail that is somewhatgeneral in nature may be found in [3, 4].