Electronic Circuit Analysis

Chapter 8

Oscillators

Learning Objectives

• Fundamental principles of oscillator circuits using positive feedback
• Working principles of
  1. Low-frequency oscillators (RC oscillators)
  2. High-frequency oscillators (LC oscillators)
  3. Crystal oscillators (Stable frequency oscillators)
  4. UJT oscillator

8.1 Introduction

• Electronic oscillator circuits are generators of periodic signal waveforms without having any external input signal Source.
• During the process of generation of AC signals, oscillator draws DC power from supply Source (raw energy) and converts it into AC power.
• Oscillator circuits can be designed to produce AC signals of desired frequency and wave shape.
  • Today modern electronic communication systems essentially use ‘sinusoidal oscillators’. ...