Gallium Nitride Based Transistors for High-Efficiency Microwave Switch-Mode Amplifiers
Science for Systems, Band 9
Stephan Maroldt
Hrsg.: Oliver Ambacher; Fraunhofer IAF, Freiburg
2012, 200 S., num. mostly col. illus., Softcover
Sprache: Englisch
Freiburg, Univ., Diss., 2012
Fraunhofer Verlag
ISBN 978-3-8396-0487-8

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Inhalt
Highly-efficient switch-mode power amplifiers are key elements in future fully-digital base stations for mobile communication. This novel base station concept reduces system energy consumption, complexity, size and costs, while the flexibility in terms of multi-band/multi-standard operation improves. In this work, innovative integrated core circuits for digital high-efficiency class-D and class-S power amplifiers based on gallium nitride technology were developed for the application in digital base stations. Therefore, high power heterostructure field effect transistors are investigated and optimized for switch-mode operation in close relation to physical device parameters like gate capacitances and on-resistance. In combination with an improved circuit design for high-speed, high-power digital switching applications, the operation of the amplifier core circuits at mobile communication frequencies between 0.45 and 2 GHz has been enabled with high circuit efficiency at the same time. Moreover, advanced technology options such as gate-recess to achieve normally-off device operation and integrated Schottky-diodes have been successfully implemented in order to improve the over-all circuit properties. Integrated circuits developed in this work enabled the realization of the worldwide first 2 GHz class-S power amplifier module.

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