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4-12 GHz and 25-34 GHz cryogenic MHEMT MMIC Low Noise Amplifiers for radio astronomy

: Aja, B.; Seelmann-Eggebert, M.; Leuther, A.; Massler, H.; Schlechtweg, M.; Gallego, J.D.; Lopez-Fernandez, I.; Diez, C.; Malo, I.; Villa, E.; Artal, E.


Institute of Electrical and Electronics Engineers -IEEE-:
IEEE MTT-S International Microwave Symposium, IMS 2012 : 17-22 June 2012, Montreal, QC, Canada
New York, NY: IEEE, 2012
ISBN: 978-1-4673-1088-8
ISBN: 978-1-4673-1085-7 (Print)
ISBN: 978-1-4673-1086-4 (Online)
ISBN: 978-1-4673-1087-1
Art.6259592, 3 S.
International Microwave Symposium (IMS) <2012, Montréal>
Fraunhofer IAF ()

MMIC Broadband Low Noise Amplifiers (LNA) for radio astronomy applications with 100 nm GaAs metamorphic High Electron Mobility Transistor (mHEMT) process have been developed. Cryogenic performance of a 4-12 GHz and a 25-34 GHz LNAs is presented. The 4-12 GHz LNA cooled at 15 K exhibits an associated gain of 3L.5 dB ± L.8 dB and average noise temperature of 5.3 K with a low power dissipation of 8 mW. Cooled to 15 K the 25-34 GHz amplifier has demonstrated a flat gain of 24.2 dB ± 0.4 dB with 15.2 K average noise temperature, and a very low power dissipation of 2.8 mW on chip. The mHEMT based LNA MMICs have demonstrated excellent noise characteristics at cryogenic temperatures for their use in radio astronomy applications.