Instrumentation and interfacing
10.1 Introduction
Very many systems designed today use digital logic components alongside sub-systems based upon analogue electronics, and also sub-systems based upon mechanical components. This allows designers the flexibility to use several design techniques in order to produce the most useful systems as a whole. From one point of view it is true that a digital system is merely a special case or subset of a general (analogue) electronic system where the signals involved always happen to fall into two well-defined voltage or current levels rather than being unconditionally variable between upper and lower limits. Hence, many basic considerations of design, such as response time, current requirements, and ...
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