ISSTT Proceedings

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A 4-8 GHz Quasi-MMIC IF Amplifier for a 690 GHz SIS Receiver

Authors:
John Ward, David Miller, Jonas Zmuidzinas, Peter O'Brien, Henry G. LeDuc, Robert Bicknell-Tassius
Abstract:
We are developing a 4 to 8 GHz cryogenic low-noise amplifier (LNA) using Quasi-Monolithic Microwave Integrated Circuit (QMMIC) technology. This amplifier has been demonstrated as an IF amplifier of a 690 GHz quasi-optical SIS receiver for the Caltech Submillimeter Observatory (CSO), and later will be used on SOFIA. The QMMIC consists of a thin-lm passive circuit on a GaAs substrate with three 160 ┬Ám gate InP HEMTs bump-bonded to it. The measured amplifier gain is over 32 dB and noise is approximately 8 Kelvin from 4 to 8 GHz at a physical temperature of 4 Kelvin. The 690 GHz SIS receiver uses a NbTiN ground plane to achieve a measured uncorrected double-sideband noise temperature of 180 Kelvin. An isolator for the 4 to 8 GHz band was used between the mixer and IF amplifier. A room-temperature IF system has been developed with gain flat to within 1 dB in the 4 to 8 GHz band. The receiver was used at the CSO with a 4 GHz analog correlation spectrometer to detect the J=6->5 emission line of carbon monoxide from the galaxy M82.
Categories:
Semiconductors
Year:
2000
Session:
10
Full-text:
Download a PDF of this paper.
Page Number(s):
561-572