ISBN 9783843957649

978-3-8439-5764-9, Reihe Elektrotechnik

Isabel Kraus
Circuit Implementations and Design Methodologies for Millimeter-Wave Applications

163 Seiten, Dissertation Ruhr-Universität Bochum (2025), Softcover, A5

Zusammenfassung / Abstract

This thesis presents novel circuit implementations and design methodologies for millimeter-wave radar applications in SiGe BiCMOS technology.

A systematic VCO design approach is introduced, based on the negative resistance model applied to the widely used Colpitts topology. By linking key performance parameters such as maximum operating temperature and phase noise to fundamental small-signal analysis and relationships between relevant component parameters, this method shows the potential to simplify conventional computationally intensive simulations.

Further oscillators for fundamental frequencies beyond 200 GHz are realized and optimized for high output power while maintaining very competitive noise and thermal performance.

In the field of frequency multiplication, various doubling architectures are investigated, comprising the successful integration of pin diodes for frequency doubling in the millimeter-wave range.

The developed oscillators are subsequently integrated into an on-chip diode-mixer-based radar transceiver. Its innovative design enables I/Q baseband signal processing based on a highly compact layout. The system performance is validated in various continuous-wave radar measurement scenarios, demonstrating its suitability for high-resolution sensing applications.

Finally, a tunable inductive output matching network for millimeter-wave power amplifiers is introduced, utilizing tunable microstrip lines as variable inductances. This realization enables dynamic load modulation, allowing adaptation to variations in bias current and frequency to enhance efficiency under changing operating conditions.

By combining detailed analyses of well-established circuit topologies with the realization of unconventional device applications, supported by experimental evidence, this work contributes to the further development of millimeter-wave IC design.