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Additional resources for Analog Electronics: Circuits, Systems and Signal Processing
Some concepts are very simple to describe in one domain whereas it would be too difficult, if not impossible, to do so in the other. 3. Engineers have to be equally confident in working in both domains. Therefore it is also important to understand the relationships between the two and to be able to translate the conclusions reached in one to its implications in the other. Note that Fourier transformation allows us to choose the most convenient domain for viewing quantities which vary in time. The process is extended in optics and image processing to the concept of space frequency.
However, the temptation to 'conveniently' ignore the origins of the model, and hence its limitations, is one to be indulged in at one's peril. Small signal models are just that, models that approximate the behaviour of the device in a limited part of its operating range. They are extremely useful to provide both valuable insights of the operation of circuits and numerical results but like all tools they must be used correctly. Small signal models are used in Chapter 3 and many of the following ones for the analysis of amplifier circuits.
It is very tempting to use this simple Unear small signal equivalent of an essentially nonlinear device in a wide range of circumstances and not just the original ones used in its derivation. However, the temptation to 'conveniently' ignore the origins of the model, and hence its limitations, is one to be indulged in at one's peril. Small signal models are just that, models that approximate the behaviour of the device in a limited part of its operating range. They are extremely useful to provide both valuable insights of the operation of circuits and numerical results but like all tools they must be used correctly.