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Design and Implementation of phase Locked Loop Using Low phase Noise Oscillator with Oversized Cavity Resonator

Aghakasiri, Ali | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50186 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Banai, Ali
  7. Abstract:
  8. Phase noise is one of the most important parameters in communication systems especially in receivers. Implementation of low phase noise oscillators has always been important.One of the most important parameters in reducing the phase noise of the oscillator is the quality factor of the cavity used in its structure. As a result, increasing the quality factor of the cavity can reduce the oscillation phase noise. Cylindrical waveguides in higher order modes have a higher quality factor than the main modes of excitement. As a result, this property can be used to increase the quality factor of the cavity and reduce the phase noise of the oscillator. This will increase the size of the cavity. The oscillator used in this project is a low phase noise oscillator in the X band using an oversized waveguide cavity. This oscillator is not feasible alone due to lack of thermal stability and high sensitivity to environmental parameters and requires methods for thermal stability and reducing its sensitivity to environmental parameters.The next step is to design and implement a phase lock loop and use this oscillator with ultra low phase noise to lock to a very stable reference at 100MHz frequency. For this purpose we use analog phase lock loops, So using aided acquisition circuits is necessary. Also implementing frequency multipliers for upconverting 100MHz reference is required
  9. Keywords:
  10. Phase Locked Loop (PLL) ; Oversized Waveguide Cavity Resonator ; X Band Low Phase Noise Oscillator ; Thermal Stability ; Phase Shifter Circuit

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