Chapter 10Amplifiers and Mixers

Amplifiers and mixers share the common property that in the ideal they are very simple. However, it is the nonideal behavior of these devices that is of interest in determining the performance of a practical communication system. This nonideal behavior adds complexity to the device models, but it needs to be simulated because it is often a major source of performance degradation that is difficult to assess analytically.

An ideal amplifier would simply multiply its input signal by a constant gain factor to change the signal’s amplitude. Practical amplifiers change a signal’s amplitude and phase by amounts that vary as a function of frequency: In other words, practical amplifiers act like filters. The models in ...

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