RF Circuits for 5G Applications

5Low-Noise Amplifiers

Jyoti Priya, Sangeeta Singh* and Bambam Kumar

Department of Electronics and Communication Engineering, National Institute of Technology, Patna, Bihar, India

Abstract

Low noise amplifiers (LNA) are the basic building blocks of RF analog circuitry. Hence it is mandatory to design the LAN block in an optimized way to enhance the entire communication block. The basic architecture and characteristics of the LNAs for 5G networks are discussed in detail in this chapter. The designs of LNAs have been carefully considered for a variety of 5G applications. Its architecture method varies depending on whether the frequency band in question is narrowband or wideband. Various topologies for achieving better optimized circuit efficiency are discussed here. LNAs are usually found at the receiver’s front end, where they absorb the antenna’s input signal and amplify it with minimal noise. The most important consideration factor for the design of an LNA is the gain and noise. Different noise figures for single phase and multistage amplifiers are illustrated in this chapter.

Keywords: Low noise amplifiers (LNA), RF performance, millimeter-wave (mmWave)

5.1 Introduction

MOSFET and BJT are two major types of three terminal devices both have their unique property and applications but MOSFETs are widely used electronics device especially in integrated circuits (ICs) which were fabricated on single chip. Compared to BJT MOSFET is quite small i.e. (it requires very small area ...