Even if such a naive approach may work for simple, low-power and low-frequency circuits, it is wrong. Simple circuits need good PCBs too. Good PCBs not only make a circuit work reliably and as intended, they also limit EMC problems as much as possible, they provide test points for system assembly and repair, and they are easy to fit in the final application. Because that is what a circuit board really is, a component in a system, and as such it has to be as good as any other component used in that system. A PCB design isn't intended to please its designer; it must please the end user, whoever that may be (Figure 1). In what follows, acronyms and jargon are used. Refer to the Glossary further on in this article to better understand the text. Also, even though this article is quite long, it is far from complete. PCB design is simply too vast a subject to be treated comprehensively in one article.
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