INVESTIGATION ON PERFORMANCE PARAMETERS OF LINEAR OSCILLATORS

Abstract

The objective of this report is to design second and third order linear sinusoidal oscillators and study their performance parameters. The approach used here for design of linear oscillators employs a positive-feedback loop consisting of an amplifier and an RC or LC frequency-selective network. There are various circuit topologies available for making oscillators, most common of them is, two integrator loop oscillators realized using different active building blocks. This Project Report contains several other topologies like three low pass filters with an inverting gain stage in a loop, sallen key low pass filter with lossy integrator and Non-inverting Amplifier in a loop, etc. There are three second order and three third order oscillator circuits proposed in this work. Along with designing of second and third order oscillators, this project report contains study of certain performance parameters of oscillators like Phase noise analyses, Total Harmonic Distortion (THD) and its variation with frequency, Frequency Stability (Short-term and Long term), Frequency Offset, Effects of Power supply variations. Then, three among the studied parameters are used to evaluate performance of the proposed oscillators.