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# Introduction

An  oscillator is an electronic circuit that generates a repetitive electronic signal or periodic waveforms from a few hertz (Hz) to several gigahertz (GHz). In the field of electronics, oscillators are known as wave generators. Wave generators use many different circuits and produce output signals such as sinusoidal, square, rectangular, sawtooth and trapezoidal wave shapes. These wave shapes serve different useful purposes in the electronic circuits.