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Design and Fabrication of Phase Locked Loop Circuit Using SAW Oscillator

Olad Dilmaghanian, Majid | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50179 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Banai, Ali
  7. Abstract:
  8. Low noise oscillator design has always been an important subject. Oscillators aren’t usually applicable in free-run mode. Thermal instability and high phase noise level near the carrier frequency are some of the reasons which makes the oscillator not to be used in free-run mode. Using the oscillator in a phase locked loop overcomes the mentioned problems. The oscillator considered in this project, uses a SAW resonator(1GHz). Low phase noise level at far carrier offsets, is the main feature of this oscillator. However, the near carrier phase noise isn’t good enough. Consequently, using a phase locked loop, we lock the oscillator to a low noise and stable source in order to increasing thermal stability and lowering near carrier phase noise. In order to achieve the best specifications for phase noise, the use of analog phase lock loops has been considered. In order to lock to a 100MHz OCXO, there should be a frequency multiplication by 10. Mixers can be used as a phase detector. Different configurations for mixers may be selected such as passive diode mixers or active transistor mixers. There is also the SPD which can be used as phase detector. Due to the use of the analog phase locked loop, it is also necessary to use an aided acquisition
  9. Keywords:
  10. Phase Locked Loop (PLL) ; Phase Noise ; Surface Acoustic Waves (SAW) Resonator ; Sampling Phase Detector

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