Frequency dependence of quasi-particle mixers

Technical Report · Mon Dec 01 04:00:00 EST 1986

OSTI ID:5371957

Danchi, W C; Sutton, E C

Since the publication of the original theoretical work on superconductor-insulator-superconductor (SIS) tunnel-junction quasi-particle mixers by Tucker, theoretical attention has largely focused on understanding the physical origin of gain (conversion efficiency greater than unity) in the mixer, the conditions for mixer saturation and the behavior of series arrays of junctions. This work is applicable to frequencies generally much less than the frequency corresponding to the superconducting energy gap. The analysis reported here primarily differs from previous work in that analytic approximations to the quantum mixer theory of Tucker are developed that allow one to derive simple power-law expressions for mixer conversion efficiency and noise temperature due to shot noise over the complete frequency range. These approximations allow one to have a qualitative understanding of frequency-dependent effects in quasi-particle mixers.

• Research Organization: California Univ., Berkeley, CA (USA)
• OSTI ID: 5371957
• Report Number(s): AD-A-210726/6/XAB
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
656100 -- Condensed Matter Physics-- Superconductivity
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CONVERSION
EFFICIENCY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC EQUIPMENT
ENERGY GAP
EQUIPMENT
FLUXMETERS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
NOISE
PHYSICAL PROPERTIES
QUASI PARTICLES
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTIVITY
TUNNEL EFFECT