Design of Negative Resistance Oscillator with Rocord Low Phase Noise

Abstract

Keywords: Oscillator, Negative resistance oscillator, Phase noise, ResonatorCopyright © 2018 Universitas Ahmad Dahlan. All rights reserved. IntroductionThe transceiver systems are becoming more complex to preserve the quality of information to transmit. These systems require local oscillator with very precise performance, the design of these oscillators is an attractive research field. The progress made in the microwave field have led to gradually replace the old type of oscillators with a more appropriate technology in terms of size and consumption. Today they take place in most communication equipment. Optimization of their characteristics is a critical point in the context of achieving the emission systems.Oscillators are structures that can be found in any electronic system since (GSM, radio communication, spacial communication, radar, electronic war and instrumentation) it is up to them to create the electrical signal in different frequency ranges. Then the quality of any system depends directly on the performance of the oscillator.In the other hand the technological tendency, the requirements of the regulations and the speed of development of the telecommunications have increasingly forced to fabricate oscillator with very precise performances in term of size, consumption, phase noise, stability and output power.To obtain very heighperformance several methods are used to achieve this goal, among theses methods we distinguish for instance: the methodbased on the negative resistance and the methodbased on the looped system.The configuration of looped system technique can only be used for a resonator with a single type of resonance. Also we have no control over the established state of the circuit, especially of other eventual instability that s ought at the desired frequency. The negative resistance concept is more understandable for reflected oscillator, although it can be applied for all types of oscillator. The harmonic balance simulation permits to determine accurately the established state of the circuit. That is why we are interested in this project to the reflected oscillator in the form of negative res istance system. Therfore in the present paper a new design of negative resistance oscillator are used for phase noise reduction, more stability of frequency, height efficiency of our oscillator and significated output power. Than the caracteristique of our oscillator show that we have

Low Phase Noise, High Output Power and Compact Microwave Planar Oscillator for C-band Applications

“…These components are integral to various electronic systems, such as Global System for Mobile Communication (GSM), radio communication, spatial communication, radar, electronic warfare, and instrumentation, due to their ability to create electrical signals in different frequency ranges. Moreover, the quality of any system directly depends on the performance of the oscillator [5]. Consequently, the study of stability and phase noise analysis constitutes a comprehensive set of tools for efficiently and accurately predicting autonomous circuit behavior [1,6,7].…”