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Low Noise SIS Mixers and Cryogenic Amplifiers for Sub-Millimeter Astronomy

Christophe Risacher (Institutionen för radio- och rymdvetenskap, Radioastronomi och astrofysik)
Göteborg : Chalmers University of Technology, 2005. ISBN: 91-7291-644-3.

This PhD thesis presents the work that was done developing radioastronomy instrumentation. The first part of this work deals with 2-stage low-noise cryogenic amplifiers using commercial GaAs HEMT transistors for frequency bnads: 3.4-4.6 GHz, 4-8 GHz and 8-9 GHz. Considerations on the design. construction and testing of these devices are described. The achieve performance is state-of-the-art, with about 9.7 K/GHz noise temperature and about 13 dB of gain per stage at a cryogenic temperature of 12 K. The applications for these amplifiers are various, even though they are designed for the intermediate frequency (IF) part of superconducting-insulating-superconducting (SIS) heterodyne receivers; they are also currently being used as radio frequency (RF) front-ends for C-band and X-band receivers at Onsala Space Observatory 20 m and 25 m telescopes.

Denna post skapades 2005-12-03. Senast ändrad 2013-09-25.
CPL Pubid: 8598


Institutioner (Chalmers)

Institutionen för radio- och rymdvetenskap, Radioastronomi och astrofysik (2005-2010)


Astronomi, astrofysik och kosmologi

Chalmers infrastruktur


Datum: 2005-09-09
Tid: 10.00
Lokal: 10.00 Sal EF, Hörsalsvägen 11, Chalmers
Opponent: Dr. Morvan Salez, Paris Observatory, France

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