Physics, electronics and electricity. Unclamped and current clamped suparamp: studies of the unbiased Josephson junction parametric amplifier
Thesis/Dissertation
·
OSTI ID:6224606
Feldman, Parrish and Chiao have analyzed the operation of a Superconducting Unbiased PARametric AMPlifier (SUPARAMP), a parametric amplifier whose active element is a Josephson junction, under the assumption that the voltage across the junction has a nearly sinusoidal time dependence. In practice, Josephson junction amplifiers will often be operating in the opposite limit (where the current through the junction is sinusoidal) because of the generally low impedances of Josephson junctions. We have extended the analysis of this opposite limit, originally due to Taur and Richards, in order to obtain results for: (1) the characteristics of the external circuit necessary to obtain high gain, (2) the gain-bandwidth product, (3) the powerwidth at a specific gain, and (4) the expected noise temperature of such an amplifier. We conclude that such an amplifier is possible but that it is very sensitive to pump power and that its noise temperature will be five to ten times greater than the physical temperature of the device. We have also considered an unclamped voltage theory.
- Research Organization:
- California Univ., Berkeley (USA)
- OSTI ID:
- 6224606
- Country of Publication:
- United States
- Language:
- English
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