Analog and Digital Communications

CHAPTER 9

Receivers

Chapter Outline

9.1 Introduction

9.2 Superheterodyne Receivers—Basic Principles

9.3 Receivers for Amplitude-Modulated Systems

9.4 Frequency Changing and Tracking

9.5 The IF Stage

9.6 Detectors

9.7 FM Receivers Versus AM Receivers

9.8 Single Sideband Receivers

9.9 Noise Calculation in Communication Systems

Learning Objectives

• Principle of Superheterodyne Receiver
• Receivers for Amplitude-Modulated Signals
• Frequency Changing and Tracking
• IF Stages, Local Oscillator Frequency, Image Frequency
• Detectors for AM Systems and Comparison of AM Receivers with FM Receivers
• Noise Calculation

9.1 Introduction

A receiver is a component of the communication circuitry that can recover a message signal from the modulated carrier. ...