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A balanced 150-240 GHz amplifier MMIC using airbridge transmission lines

: Längst, J.; Diebold, S.; Massler, H.; Tessmann, A.; Leuther, A.; Zwick, T.; Kallfass, I.


Institute of Electrical and Electronics Engineers -IEEE-:
INMMIC 2012, Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits : 3rd - 4th September 2012, Dublin, Ireland
New York, NY: IEEE, 2012
ISBN: 978-1-4673-2950-7 (Print)
ISBN: 978-1-4673-2948-4 (Online)
ISBN: 978-1-4673-2949-1
3 S.
Wokshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC) <2012, Dublin>
Fraunhofer IAF ()
airbridge; balanced amplifier; hybrid coupler; metamorphic high electron mobility transistor (mHEMT); monolithic millimeter-wave integrated circuit (MMIC)

A compact balanced amplifier monolithic millimeter-wave integrated circuit (MMIC) for the frequency range from 150 to 240 GHz is developed using airbridge microstrip (AirMS) transmission lines in a 35 nm gate-length metamorphic high electron mobility transistor (mHEMT) technology. The hybrid couplers for the balanced design are realized using airbridge-stacked coupled lines. The balanced three-stage cascode amplifier achieves a small-signal gain of more than 15 dB between 150 and 240GHz, from 210 to 230GHz even more than 23dB. In the latter frequency range the variation of the measured gain curve is less than 0.8 dB. Due to the balanced design, the input and output reflections are lower than - 12dB up to 227GHz, and lower than -6 dB in the whole frequency range.