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High-T c superconducting thin film/GaAs MESFET hybrid microwave oscillator |
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| Authors: | Biaobing Jin Lin Kang Ruixin Wu Jianyu Zhang Qiheng Cheng Peiheng Wu Dong Jing Gang Jiao Kai Shao Mingming Jiang Jiazong Zhang Minsong Sun Yunyi Wang Yueliang Zhou Huibin Lü Shifa Xu Meng He Xiaoping Wang Bingchuan Yang Jian Lu Qishao Zhang |
| Institution: | (1) Department of Electronic Science and Engineering, Center for Advanced Studies in Science and Technology of Microstructures, Nanjing University, 210093 Nanjing, China;(2) Nanjing Electronic Device Institute, 210016 Nanjing, China;(3) State Key Laboratory of Millimeter Waves, Southeast University, 210096 Nanjing, China;(4) Institute of Physics, Chinese Academy of Sciences, 100080 Beijing, China;(5) General Research Institute for Non-ferrous Metal, 100088 Beijing, China;(6) University of Electronic Science and Technology of China, 610054 Chengdu, China;(7) Department of Radio Engineering, Nanjing University of Posts and Telecommunications, 210003 Nanjing, China |
| Abstract: | A high-T c superconducting (HTSC) thin film/GaAs MESFET hybrid microwave oscillator operated at 10.6 GHz has been designed, fabricated and characterized. Microstrip line structures were used throughout the circuit with superconducting thin film YBa2Cu3O7-δ(YBCO) as the conductor material. The YBCO thin films were deposited on 15 mm×10 mm×0.5 mm LaAlO3 substrates. The oscillator was common-source, series feedback type using a GaAs-MESFET (NE72084) as the active device and a superconducting microstrip resonator as the frequency stabilizing element. By improving the unloaded quality factorQ 0 of the superconducting microstrip resonator and adjusting the coupling coefficient between the resonator and the gate of the MESFET, the phase noise of the oscillator was decreased. At 77 K, the phase noise of the oscillator at 10 kHz offset from carrier was −87 dBc/Hz. Project supported by the National Center for Research and Development on Superconductivity of China. |
| Keywords: | superconducting thin film superconducting microstrip resonator GaAs MESFET microwave oscillator phase noise |
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