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Optimizing double-sideband SIS quasiparticle mixers

Woody, D. P. and Wengler, M. J. (1991) Optimizing double-sideband SIS quasiparticle mixers. IEEE Transactions on Magnetics, 27 (2). pp. 3388-3390. ISSN 0018-9464. doi:10.1109/20.133939.

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Calculations based on the quantum theory of mixing in single-particle tunnel junctions show that there is a fairly simple strategy for optimizing the performance of double-sideband superconductor-insulator-superconductor (SIS) quasiparticle mixers. The best mixer noise temperature is obtained when the signal source is matched to the local oscillator (LO) admittance of the junction. This applies over a very wide range of LO and DC bias conditions. These calculations support the contention that it is the energy dissipation in the device which is important in determining the noise performance, not the small signal admittance or the power gain. This appears to be another demonstration of the Callen and Welton fluctuation-dissipation theorem. which states that it is the dissipation of energy which is responsible for the noise generation in a wide range of devices, and it is this energy dissipation mechanism to which the signal should be coupled to minimize the noise.

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Additional Information:© 1991 IEEE. Manuscript received September 24, 1990.
Group:Owens Valley Radio Observatory (OVRO)
Issue or Number:2
Record Number:CaltechAUTHORS:20190219-120732353
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Official Citation:D. P. Woody and M. J. Wengler, "Optimizing double-sideband SIS quasiparticle mixers," in IEEE Transactions on Magnetics, vol. 27, no. 2, pp. 3388-3390, March 1991. doi: 10.1109/20.133939
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92980
Deposited By: Joy Painter
Deposited On:19 Feb 2019 22:03
Last Modified:16 Nov 2021 16:54

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