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A New Method For Phase Noise Measurement of Microwave Oscillators Using Phase Shifter-Less Frequency Discriminator

Gheidi, Hamed | 2011

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 41744 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Banai, Ali
  7. Abstract:
  8. In this thesis, a modified method based on frequency discriminator technique is presented for measuring phase noise of microwave oscillators. In the proposed method, the phase shifter is omitted. In contrast, a 90° hybrid with one more channel containing a phase detector, and an LNA is added to the measurement setup. It can be said that an I/Q phase noise detection has been developed. With the proposed method, tuning of the variable phase shifter is not needed anymore. Therefore, the measurement is done automatically and as a result the measurement time is decreased. Beside the wideband property of the new technique, another considerable advantage is that the method is theoretically self calibrated. Comparison of the measured data (the new technique, the conventional frequency discriminator method, and the two-oscillator technique) shows the validity of the proposed method. By generalizing the method presented for the phase noise measurement and implementing it with analog circuitry, a new broadband structure has been developed for demodulation of FM signals over the microwave frequency range. The tests accomplished with the proposed demodulator for different FM signals validate the introduced demodulator.

  9. Keywords:
  10. Phase Noise Measurment ; Frequency Discriminator ; Delay Lines ; Frequency Demodulator ; Microwave Oscillator ; Wideband Receiver

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