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On 32-GHz cryogenically cooled HEMT low-noise amplifiersThe cryogenic noise temperature performance of a two-stage and a three-stage 32 GHz High Electron Mobility Transistor (HEMT) amplifier was evaluated. The amplifiers employ 0.25 micrometer conventional AlGaAs/GaAs HEMT devices, hybrid matching input and output microstrip circuits, and a cryogenically stable dc biasing network. The noise temperature measurements were performed in the frequency range of 31 to 33 GHz over a physical temperature range of 300 K down to 12 K. Across the measurement band, the amplifiers displayed a broadband response, and the noise temperature was observed to decrease by a factor of 10 in cooling from 300 K to 15 K. The lowest noise temperature measured for the two-stage amplifier at 32 GHz was 35 K with an associated gain of 16.5 dB, while the three-stage amplifier measured 39 K with an associated gain of 26 dB. It was further observed that both amplifiers were insensitive to light.
Document ID
19890010965
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bautista, J. J. (General Electronic Labs., Inc., Silver Spring MD., United States)
Ortiz, G. G. (General Electronic Labs., Inc., Silver Spring MD., United States)
Duh, K. H. G. (General Electronic Labs., Inc., Silver Spring MD., United States)
Kopp, W. F. (General Electronic Labs., Inc., Silver Spring MD., United States)
Ho, P. (General Electronic Labs., Inc., Silver Spring MD., United States)
Chao, P. C. (General Electronic Labs., Inc., Silver Spring MD., United States)
Kao, M. Y. (General Electronic Labs., Inc., Silver Spring MD., United States)
Smith, P. M. (General Electronic Labs., Inc., Silver Spring MD., United States)
Ballingall, J. M. (General Electric Co. Syracuse, NY., United States)
Date Acquired
September 5, 2013
Publication Date
November 15, 1988
Publication Information
Publication: The Telecommunications and Data Acquisition Report
Subject Category
Electronics And Electrical Engineering
Accession Number
89N20336
Funding Number(s)
CONTRACT_GRANT: JPL-957352
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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