In many applications, particularly digital cellular systems, spectral
regrowth is a major problem and a lot of design effort is focused on compensating for this
problem, either by linearizing the
components (see ), or by selecting modulation formats such as GMSK that are particularly tolerant to amplitude
non-linearity.
In fact most components, mixers, op-amps, couplers, and so on are not perfectly linear and
hence introduce amplitude distortion; however, the distortion is usually much less than
that introduced by the higher power or active RF components within a system.
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