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  4. Noise degradation of cascodes in broadband power amplifiers
 
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2017
Conference Paper
Title

Noise degradation of cascodes in broadband power amplifiers

Abstract
This paper compares the noise performance of the common-source and the cascode topology. Although the cascade topology has several advantages over the common-source stage, the noise performance degrades due to the channel noise and the induced gate noise of the common-gate stage. To underline the theory two multi-decade GaN feedback power amplifiers were designed in common-source and cascode topology, using a submicron AlGaN/GaN MMIC technology on SiC substrate. Both designs achieve 13 dB gain and simultaneously good input and output matching. The 3 dB cutoff frequency of the common-source design is 12 GHz and the cascode feedback amplifier achieves even 17 GHz. At mid-band the common-source and the cascode design achieve a moderate noise figure of 3 dB and 4 dB while maintaining an output power over the complete frequency range of 28dBm and 29dBm respectively.
Author(s)
Huber, Thomas
Graz University of Technology
Quay, Rüdiger  orcid-logo
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Bösch, Wolfgang
Graz University of Technology
Mainwork
INMMiC 2017, International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits. Proceedings  
Conference
International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC) 2017  
DOI
10.1109/INMMIC.2017.7927298
Language
English
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
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