DocumentCode
947629
Title
SIS Mixer to HEMT Amplifier Optimum Coupling Network (Short Paper)
Author
Weinreb, Sander
Volume
35
Issue
11
fYear
1987
fDate
11/1/1987 12:00:00 AM
Firstpage
1067
Lastpage
1069
Abstract
The coupling network between a superconductor-insulator-superconductor (SIS) mixer and a high-electron-mobility-transistor (HEMT) amplifier is investigated from the point of view of minimizing the overall noise temperature and also increasing the saturation level of the mixer. The effect of a negative output impedance of the mixer upon the amplifier noise is considered and an optimum negative source resistance is found. The amplifier noise at this optimum negative source resistance is shown to be related to the noise wave coming out of the amplifier input terminals. Key words: SIS, HEMT, low-noise, negative resistance.
Keywords
Acoustic reflection; Active noise reduction; Bandwidth; HEMTs; Impedance; Noise cancellation; Noise figure; Radio frequency; Temperature; Voltage;
fLanguage
English
Journal_Title
Microwave Theory and Techniques, IEEE Transactions on
Publisher
ieee
ISSN
0018-9480
Type
jour
DOI
10.1109/TMTT.1987.1133809
Filename
1133809
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