Parametric amplification using a point contact josephson junction
The use of a point contact Josephson junction as a parametric amplifier was studied at 9 GHz. The junction used in the experiments was a two-hole RF-biased SQUID (Superconducting Quantum Interference Device) and the pump frequency was close to the signal frequency. The total gain achieved was 10 dB with a bandwidth of 3 MHz. Simultaneously a strong noise component was visible in the frequency band where the amplification takes place. On the basis of these observations an analysis of the amplification was carried out. Results show that the observed gain properties are in accordance with the amplifier model in which two idler frequencies simultaneously take part in the amplification process. It is concluded that the choice of the coupling structure between the low impedance junction and the external microwave circuit is good. It can be used in further amplifier realizations and in magnetometer applications where the sensitivity of the system can be improved by using microwave pump power.
- Research Organization:
- Helsinki Univ. of Technology, Espoo (Finland). Radio Lab.
- OSTI ID:
- 6939451
- Report Number(s):
- N-78-11315
- Country of Publication:
- United States
- Language:
- English
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