Analog and Digital Communications

CHAPTER 8

Angle Modulation Techniques

Chapter Outline

8.1 Introduction

8.2 Bandwidth Requirements for Angle-Modulated Waves

8.3 Generation of Angle-Modulated Waves

8.4 Demodulation of Angle Modulated Signals

Learning Objectives

• Introduction to Angle Modulation and Bandwidth Requirement.
• Generation of Angle-Modulated Carrier—phase and Frequency Modulation for Narrowband (NB) and Wideband (WB).
• Reactance Modulator Circuits.
• Detection of Angle Modulation—slope Detector, Foster-Seeley Discriminator, Ratio Detector, Phase-locked Loop

8.1 Introduction

We have seen earlier that for angle modulation the carrier signal, which is a pure sinusoid represented as S_c(t) = A_c sin (ω_ct + θ) with φ (t) = (ω_ct + θ) as the argument or angle, the instantaneous ...