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A Phase Noise Study on Coupled Oscillator Arrays

A Phase Noise Study on Coupled Oscillator Arrays. Summer 2002 SURE Program Jack Chao, Univ. of Michigan - Ann Arbor Advisors: Dr. L. Wilson Pearson, Chris Tompkins. Beam Steering. Rotate beam axis by changing phase delay between elements. Coupled Oscillator Array.

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A Phase Noise Study on Coupled Oscillator Arrays

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  1. A Phase Noise Study on Coupled Oscillator Arrays Summer 2002 SURE Program Jack Chao, Univ. of Michigan - Ann Arbor Advisors: Dr. L. Wilson Pearson, Chris Tompkins

  2. Beam Steering • Rotate beam axis by changing phase delay between elements

  3. Coupled Oscillator Array • Phase difference between adjacent oscillators can be controlled • Less complex circuitry for beam steering Antennas Oscillators

  4. Problem: All oscillator signals have phase fluctuation (phase noise or “jitter”) Proposed solution: Injection lock at multiple points in array* Summer objective: verify multi-point injection locking reduces phase noise A Problem: Phase Noise *H.-C. Chang, et. al., “Phase Noise in Externally Injection-Locked Oscillator Arrays,” IEEE Trans. Microwave Theory Tech., vol. 45, pp. 2035-2042, Nov. 1997.

  5. Injection Locking Injection Locking a Single Voltage-Controlled Oscillator Free Running Signal Injection Injection Locked Oscillates at 0 More Phase Noise Oscillates at 1 Less Phase Noise External Signal at 1 (1 close to 0)

  6. Fabrication • Oscillator layer (oscillates ~10 GHz) • Non-overlapping oscillation ranges • Settled on 5-element array instead of 9-element

  7. Fabrication (cont’d) • Transmit layer

  8. Injection Locking Setup • Elements 3,5,7 were injection locked in various combinations • Antenna received array’s combined signal Antennas Oscillators 3 5 7 Phase-shifters Clean Source Signal

  9. View from Spectrum Analyzer

  10. Results - Injection Schemes

  11. Results - Injection Power

  12. Conclusions • Experimentally verified increasing number of injection ports decreases phase noise • Diminishing returns with increase in ports • Increasing injection power decreases phase noise • Greater effect on phase noise with less ports

  13. Acknowledgements • Dr. Jim Harriss • Xing Wang

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