Microwave power source, and a method for generating microwave signals
AssigneeIQM Finland Oy
InventorJuha HASSEL
Life of this patent
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Abstract
A microwave power source comprises a Josephson junction or junction array and a resonant tank circuit coupled thereto and configured to resonate at one or more frequencies of Josephson oscillation. An output coupler is coupled to said resonant tank circuit for outputting microwave power from said resonant tank circuit. A bias circuit is coupled to the Josephson junction and configured to produce a bias voltage across the Josephson junction. Said bias circuit comprises a current path of variable resistance between a bias input of the microwave power source and a reference potential.
Claims14
A microwave power source, comprising:
- a Josephson junction or junction array,
- a resonant tank circuit coupled to the Josephson junction or junction array and configured to resonate at one or more frequencies of Josephson oscillation generated in the Josephson junction or junction array,
- an output coupler coupled to said resonant tank circuit for outputting microwave power from said resonant tank circuit, and
- a bias circuit coupled to the Josephson junction or junction array and configured to produce a bias voltage across the Josephson junction or junction array;
- wherein said bias circuit comprises a current path of variable resistance between a bias input of the microwave power source and a reference potential.
A method for generating microwave signals, comprising:
- biasing a Josephson oscillator to an operating point on an original Shapiro step with an upwards sweep of bias current brought to a bias input of the Josephson oscillator,
- subsequently increasing a resistance on a current path used for said biasing, causing said operating point to migrate onto an extension of said original Shapiro step at smaller bias current values, and
- utilizing Josephson oscillations coupled out of a resonant tank circuit of said Josephson oscillator as the generated microwave signal.
Dependencies are inferred from the claim text.