1.2 IDEAL DIODEThe first electronic device to be introduced is called the diode. It is the simplest ofsemiconductor devices but plays a very vital role in electronic systems, having characteristicsthat closely match those of a simple switch. It will appear in a range of applications,extending from the simple to the very complex. In addition to the detailsof its construction and characteristics, the very important data and graphs to be foundon specification sheets will also be covered to ensure an understanding of the terminologyemployed and to demonstrate the wealth of information typically availablefrom manufacturers.The term ideal will be used frequently in this text as new devices are introduced.It refers to any device or system that has ideal characteristics—perfect in every way.It provides a basis for comparison, and it reveals where improvements can still bemade. The ideal diode is a two-terminal device having the symbol and characteristicsshown in Figs. 1.1a and b, respectively.
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