Noise in Josephson mm-wave mixers

Conference · Sat Mar 01 04:00:00 EDT 1975 · IEEE Trans. Magn., v. MAG-11, no. 2, pp. 798-799

OSTI ID:4121947

Claassen, J H; Taur, Y; Richards, P L

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 54$sup 0$K. Both of these results are approximately 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 $Omega$ = h$omega$/2eI/sub 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. (auth)

• Research Organization: Univ. of California, Berkeley
• NSA Number: NSA-33-017106
• OSTI ID: 4121947
• Conference Information: Journal Name: IEEE Trans. Magn., v. MAG-11, no. 2, pp. 798-799
• Country of Publication: United States
• Language: English

Related Subjects

*JOSEPHSON JUNCTIONS-- NOISE
*MULTIPLEXERS-- JOSEPHSON JUNCTIONS
420201* --Engineering--Facilities & Equipment--Cryogenic & Superconducting Equipment & Devices
ANALYTIC FUNCTIONS
COMPARATIVE EVALUATIONS
MATHEMATICAL MODELS
MICROWAVE RADIATION
N42200 --Engineering--Facilities & Equipment
N42220* --Engineering--Facilities & Equipment--Cryogenic & Superconducting Equipment & Devices
SCHOTTKY BARRIER DIODES
SIMULATION