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A low phase noise all cryogenic microwave oscillator based on a superconductor resonator

Abstract : 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 an harmonic balance software and realized on 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.
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Submitted on : Thursday, September 24, 2020 - 6:19:45 PM
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David Chaudy, Olivier Llopis, B. Marcilhac, Y. Lemaître, O. d'Allivy Kelly, et al.. A low phase noise all cryogenic microwave oscillator based on a superconductor resonator. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Institute of Electrical and Electronics Engineers, 2020, pp.1-1. ⟨10.1109/TUFFC.2020.3023198⟩. ⟨hal-02948581⟩

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