Article

Noise in Josephson effect mm-wave mixers

Univ. of Calif., Berkeley, Ca.
IEEE Transactions on Magnetics (impact factor: 1.36). 04/1975; DOI:10.1109/TMAG.1975.1058615 pp.798 - 799
Source: IEEE Xplore

ABSTRACT We have recently shown that point contact Josephson junctions can function as millimeter wave heterodyne mixers with conversion gain. The best results achieved thus far show a single sideband conversion gain of 1.3 and a mixer contribution to the system noise temperature of 54K. Both of these results are ∼ 5 times better than the best published figures for cooled Schottky barrier diode mixers operated at the same frequency. The measured noise for a variety of junctions can be expressed as a universal function of the normalized rf frequency Omega = hbar omega/2eI_{c}R . It is about a factor 2 larger than the calculated noise arising from the thermal noise in the junction shunt resistance R. The noise calculation was done for the resistively shunted junction model using an analog junction simulator.

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Keywords

analog junction simulator
 
calculated noise
 
conversion gain
 
factor 2 larger
 
measured noise
 
millimeter wave heterodyne mixers
 
mixer contribution
 
noise calculation
 
resistively shunted junction model
 
Schottky barrier diode mixers
 
single sideband conversion gain
 
system noise temperature
 
thermal noise
 
universal function
 

J. Claassen