Electrical Engineering

Page 1

F.Y.J.C Science

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Oscillators CLASSIFICATION OF OSCILLATORS An oscillator in general may be defined as an electronic circuit capable of generating repetitive output waveform by using DC supply and without any input AC signal hence it is known as DC to AC converter. Practically it draws DC energy and converts it into bi-directional AC. Oscillator may be classified in different ways as follows: A) According to wave form i) Sinusoidal

ii) Non sinusoidal

B) According to design principle i) Positive feedback (e.g. LC oscillators, RC oscillators) (Sawtooth oscillator using UJT) C) According to frequency range i) ii)

Audio frequency (AF) oscillator-20Hz to 20KHz Radio frequency (RF) Oscillator-20KHz to 30MHz

iii)

Video frequency Oscillator-DC to 5MHz

iv)

High frequency Oscillator-1.5 MHz to 30MHz

v)

Very high frequency (VHF) Oscillator-30MHz TO 300MHz

D) According to component used i) L-C Oscillator

2)R-C Oscillator

3)Crystal Oscillator

BASIC REQUIREMENTS OF AN OSCILLATOR An oscillator circuit normally consists of: i) An amplifier

ii) Positive feedback

iii) Amplitude limiting device

iv) Frequency control circuit

Oscillator should have these four sections to get sustained oscillations.

Oscillators

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Electrical Engineering by E Keeda - Issuu