[asac][almanews] ALMA Memo 4608 Released
Stacy Oliver
soliver at nrao.edu
Fri May 30 16:51:25 EDT 2003
ALMA MEMO #460
MEASUREMENT OF GAIN COMPRESSION IN SIS MIXER RECEIVERS
A. R. Kerr, J. Effland, S.-K. Pan, G. Lauria, A. W. Lichtenberger and R. Groves
2003-05-15
Keywords: Superconductor-Insulator-Superconductor mixers, saturation, gain compression, dynamic range
When an SIS mixer is partially saturated by broadband noise, it continues to exhibit a linear response to a small CW test signal,
with the small-signal gain depending on the level of the saturating noise. This allows the CW test signal to be used as an indicator
of the receiver gain in the presence of high-level noise. If not taken into account, gain compression can be a significant factor
limiting the accuracy of high precision radio astronomy instruments.
View a pdf version of ALMA Memo #460.
http://www.alma.nrao.edu/memos/html-memos/alma460/memo460.pdf
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