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Design of a stable dielectric resonator oscillator

Design of a stable dielectric resonator oscillator. inż. Andrzej Stefański mgr. inż. Krzysztof Czuba dr inż. Krzysztof Antoszkiewicz Instytut Systemów Elektronicznych PW. Outline. Objective and specifications Dielectric resonator Problems to solve Current project status Future plans.

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Design of a stable dielectric resonator oscillator

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  1. Design of a stable dielectric resonator oscillator inż. Andrzej Stefański mgr. inż. Krzysztof Czuba dr inż. Krzysztof Antoszkiewicz Instytut Systemów Elektronicznych PW

  2. Outline • Objective and specifications • Dielectric resonator • Problems to solve • Current project status • Future plans Design of a stable dielectric resonator oscillator A. Stefański, ISE, PW

  3. Objective • Low phase noise Dielectric Resonator Oscilator (DRO) is needed for the phase reference system for the UVFEL/XFEL projects • DRO will be synchronized with the Master Oscillator • DR based oscillators offer very high noise performance but generator design is very difficult Design of a stable dielectric resonator oscillator A. Stefański, ISE, PW

  4. Specifications • Output freq. : 1299.9996 MHz • Voltage controlled input • Output power : 10 dBm • Harmonics : < -25 dBc • Sub-harmonics : < -60 dBc • Spurious : < -80 dBc • Extremely low phase noise – next page Design of a stable dielectric resonator oscillator A. Stefański, ISE, PW

  5. Required phase noise level Design of a stable dielectric resonator oscillator A. Stefański, ISE, PW

  6. Dielectric Resonator Design of a stable dielectric resonator oscillator A. Stefański, ISE, PW

  7. Design issues/problems • Selection of low-noise transistor • Oscillator circuit design • Tuning method selection • Minimizing noise from tuning circuit • Selection of DR coupling method – oscillation and output signal • Mechanical design: oscillator cavity, DR fixture – significantly affect oscillator performance Design of a stable dielectric resonator oscillator A. Stefański, ISE, PW

  8. Recent development Design of a stable dielectric resonator oscillator A. Stefański, ISE, PW

  9. Current project status • Analysis of existing design, found ways for oscillator improvement • 3D electromagnetic field simulations in progress. Objective – find optimum coupling method, estimate quality factor and extract S-parameters for electronic circuit simulations • 3D model created and first simulation results obtained Design of a stable dielectric resonator oscillator A. Stefański, ISE, PW

  10. Design of a stable dielectric resonator oscillator A. Stefański, ISE, PW

  11. Design of a stable dielectric resonator oscillator A. Stefański, ISE, PW

  12. Design of a stable dielectric resonator oscillator A. Stefański, ISE, PW

  13. Future plans • Cavity optimization • 3D simulations • S-parameters extraction • Circuit optimization • Find transistor with best noise performance • Apply it to optimal circuit • Make project and build model • Measurements Design of a stable dielectric resonator oscillator A. Stefański, ISE, PW

  14. Thank you

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