Phase Noise Reduction of a Dielectric Resonator Oscillator due to Flicker Noise by Selection Various Bias Circuits

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Amirli, Sahar | 2023

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 56221 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Banai, Ali
Abstract:
Phase noise is one factor determining the quality of radar and telecommunication systems. Oscillators play an important role in system phase noise, as a signal generator for information modulation. Due to the greater impact of flicker noise at near carrier frequency than other types of phase noise sources, its reduction will greatly impact the phase noise of the telecommunication system. In this research, the simulation of phase noise and flicker noise of an oscillator with various types of bias circuit methods, such as bias with two independent sources, self-bias, improved self-bias, active bias, and low-frequency feedback, has been done. Then, a microwave dielectric resonator oscillator was designed at 4 GHz frequency, verified, and measured the methods mentioned. The results indicate the improvement of the phase noise at the near carrier frequency in the proposed methods
Keywords:
Microwave Oscillator ; Dielectric Resonator Antenna ; Phase Noise ; Flicker Noise ; Bias Circuits ; Noise Reduction

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