A wideband cryogenic microwave low-noise amplifier

Controllable coupling between the odd and even fundamental modes of an asymmetric half-wavelength superconducting coplanar waveguide resonator is demonstrated. The resonant frequency of the even mode Ωe could be tuned by an external magnetic field, while the resonant frequency of the odd mode Ωo is field independent. To realize the tunability of Ωe, the central conductor of the NbN-based resonator was galvanically coupled to an array of Al-based rf-SQUIDs (radio frequency superconducting quantum interferometer device). These rf-SQUIDs are placed in only one resonator gap, ensuring its strong asymmetry. By adjusting the appropriate external magnetic flux Φ, equal frequencies of both modes were obtained. At this resonant point Ωo(Φ)=Ωe(Φ) an avoided level crossing of the eigenfrequencies was observed, demonstrating the coupling between the odd and even fundamental modes.

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A wideband cryogenic microwave low-noise amplifier

Cited by 6 publications

References 29 publications

Design of high gain high output matched narrow band LNA using induced degeneration topology for receiver applications

Design of high gain high output matched narrow band LNA using induced degeneration topology for receiver applications

Current-voltage and frequency response characteristics of low-noise bipolar transistors at cryogenic temperatures

Controllable coupling between fundamental modes in an asymmetric superconducting coplanar waveguide resonator

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