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A Low Phase Noise All Cryogenic Microwave Oscillator Based on a Superconductor Resonator
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control ( IF 3.0 ) Pub Date : 2020-09-14 , DOI: 10.1109/tuffc.2020.3023198
D. Chaudy , O. Llopis , B. Marcilhac , Y. Lemantre , O. d'Allivy Kelly , J.-M. Hode , J.-M. Lesage

A 1-GHz full cryogenic oscillator is presented. The oscillator is based on a planar superconductor resonator featuring a loaded ${Q}$ factor of 200 000 at low microwave input power (unloaded ${Q}$ of 400 000) and on amplifying parts realized with SiGe bipolar transistors. The circuit is designed with a harmonic balance software and realized on an alumina substrate. A nonlinear model is extracted at low temperature both for the transistor and the resonator. This double nonlinearity increases the difficulty of the oscillator design and implies a strategy to limit the power inside the resonator. The vibrations of the cryogenerator are also a serious issue to get high performance. Finally, the oscillator features a phase noise of −112 dBc/Hz at 100-Hz offset frequency and a phase noise floor of −170 dBc/Hz (100-kHz offset) at a temperature of 65 K.

中文翻译:

基于超导体谐振器的低相位噪声全低温微波振荡器

提出了一种1 GHz全低温振荡器。该振荡器基于一个平面超导体谐振器,该谐振器具有负载 $ {Q} $ 在低微波输入功率下(空载)为20万 $ {Q} $ (400,000个)和使用SiGe双极晶体管实现的放大部件。该电路采用谐波平衡软件进行设计,并在氧化铝基板上实现。在低温下为晶体管和谐振器提取非线性模型。这种双重非线性增加了振荡器设计的难度,并暗示了一种限制谐振器内部功率的策略。低温发生器的振动也是获得高性能的重要问题。最后,该振荡器在100Hz偏移频率下具有-112 dBc / Hz的相位噪声,在65 K温度下具有-170 dBc / Hz(100kHz偏移)的本底噪声。
更新日期:2020-09-14
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