In this chapter, we discuss the concepts of amplification that we use to overcome noise. We review the idea of power amplifiers that are used by the transmitter and introduce metrics for nonlinear contributions in signal amplification. We discuss the concept of the low-noise amplifier (LNA) that is typically the first amplifier in the receiver chain. We motivate this type of amplifier by introducing the idea of the noise figure. Finally, we review the idea of automatic gain control.
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