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Highly integrated switching calibration front-end MMIC with active loads for W-band radiometers

: Weissbrodt, E.; Leuther, A.; Schlechtweg, M.; Kallfass, I.; Ambacher, O.

European Microwave Association:
7th European Microwave Integrated Circuits Conference, EuMIC 2012. Proceedings : 29-30 Oct 2012, Amsterdam, The Netherlands, European Microwave Week
Louvain-la-Neuve: European Microwave Assiciation, 2012
ISBN: 978-2-87487-028-6
European Microwave Integrated Circuits Conference (EuMIC) <7, 2012, Amsterdam>
European Microwave Week (EuMW) <15, 2012, Amsterdam>
Conference Paper
Fraunhofer IAF ()
active loads; ACL; AHL; radiometer; calibration; W-band; GaAs; MMIC; mHEMT; FET-switch; SP5T; SCFE

A millimeter-wave monolithic integrated circuit (MMIC) consisting of a W-band (75 - 100 GHz) single-pole-fivethrow (SP5T) switch and multiple internal active and passive loads for radiometer calibration was designed and manufactured in a low noise 50 nm GaAs mHEMT technology. This highly compact and integrated front-end device for radiometer systems is capable of fast ultra-fast switching between two identical input ports (e.g. for polarimetric applications) and three internal calibration references. It allows an accurate multi-load calibration with noise temperatures between 220 K and 1750 K at the output of the device. Compared to conventional calibration methods this marks a substantial advantage in terms of size, mass, power consumption, complexity and repetition rate.