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

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

3. 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

4. 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

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

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

7. 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

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

9. 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

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

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

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

13. 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

14. Thank you