Chapter 8. Low-Noise Amplifiers

8.1 Introduction

A low-noise amplifier is generally placed at the front end of a receiver and plays the role of amplifying received signals that are weak. As shown in Figure 8.1, the input signal of the low-noise amplifier consists of both signal Ps and noise Ns that are amplified together. The impedance Zo at the source and load has a typical value of 50 Ω, which is determined by a coaxial connector. In addition, the internal noise sources of the low-noise amplifier also contribute to output noise power No. As a result, the signal-to-noise ...

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