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On-chip post-production tuning of I/Q frequency converters using adjustable coupler terminations

: Grötsch, Christopher; Tessmann, Axel; Wagner, Sandrine; Kallfass, Ingmar


Institute of Electrical and Electronics Engineers -IEEE-; Gallium Arsenide Application Symposium Association -GAAS-; IEEE Electron Devices Society:
12th European Microwave Integrated Circuits Conference, EuMIC 2017 : 9-12 October 2017, Nuremberg, Germany
Piscataway, NJ: IEEE, 2017
ISBN: 978-2-87487-048-4
ISBN: 978-1-5386-3966-5
European Microwave Integrated Circuits Conference (EuMIC) <12, 2017, Nuremberg>
European Microwave Week (EuMW) <2017, Nuremberg>
European Microwave Conference (EuMC) <47, 2017, Nuremberg>
Fraunhofer IAF ()

This paper presents a broadband integrated double balanced I/Q-upconverter at 73.5GHz in a 50nm InGaAs based metamorphic high electron mobility transistor technology including Lange couplers with voltage-controlled variable termination resistance. The variable resistance is implemented by using resistive FETs. This MMIC is designed for broad band communication with controllable LO suppression at the output. Introducing Lange couplers with voltage-controlled termination resistance offers a post-production measure to optimize MMICs with respect to I/Q-imbalance and LO isolation. In comparison to conventional 50 termination resistances the LO isolation could be improved by up to 12 dB over a bandwidth of 20 GHz while maintaining near constant conversion gain.