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A coplanar 94 GHz low-noise amplifier MMIC using 0.07 µm metamorphic cascode HEMTs

Eine rauscharme 94 GHz Verstärker Schaltung basierend auf Koplanartechnologie und 0,07 µm metamorphen Kaskodentransistoren
: Tessmann, A.; Leuther, A.; Schwörer, C.; Massler, H.; Kudszus, S.; Reinert, W.; Schlechtweg, M.


Thal, H. ; IEEE Microwave Theory and Techniques Society:
IEEE MTT-S International Microwave Symposium digest 2003. Vol.3 : June 8 - 13, 2003, Pennsylvania Convention Center, Philadelphia, Pennsylvania
Piscataway, NJ: IEEE, 2003
ISBN: 0-7803-7695-1
ISBN: 0-7803-7696-X
International Microwave Symposium (IMS) <2003, Philadelphia/Pa.>
Conference Paper
Fraunhofer IAF ()
metamorphic high electron mobility transistor; metamorpher Transistor mit hoher Elektronenbeweglichkeit; composite-channel; zweigeteilter Kanal; reliability; Zuverlässigkeit; low-noise amplifier; rauscharmer Verstärker; MMIC; monolithisch integrierte Schaltung; 0.07 µm cascode HEMT; 0,07 µm Kaskoden Transistor; coplanar waveguide; koplanarer Wellenleiter

A 94 GHz low-noise amplifier MMIC (LNA) has been developed, based on a coplanar technology utilizing 0.07 µm depletion type metamorphic HEMTs (MHEMTs). The realized single-stage cascode LNA achieved a small-signal gain of more than 12 dB and an average noise figure of 2.3 dB over the bandwidth from 80 to 100 GHz. With an indium content of 80 % in the channel a 2 x 30 µm MHEMT device has shown a transit frequency (ft) of 290 GHz, an extrinsic transconductance of 1450 mS/mm and a maximum stable gain (MSG) of 11 dB at 94 GHz. Using two HEMTs connected in cascode configuration the MSG could be increased to 22 dB. To stabilize the cascode device and to increase the bandwidth of the amplifier circuit a resistive feedback was integrated into the HEMT in common-gate configuration. Coplanar topology in combination with cascode transistors resulted in a chip-size of only 1x1mm2.