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Noise degradation of cascodes in broadband power amplifiers

: Huber, Thomas; Quay, Rüdiger; Bösch, Wolfgang


Plank, Thomas (Ed.) ; Institute of Electrical and Electronics Engineers -IEEE-; Graz University of Technology, Institute of Microwave and Photonic Engineering:
INMMiC 2017, International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits. Proceedings : Graz, Austria, April 20-21, 2017
Piscataway, NJ: IEEE, 2017
ISBN: 978-1-5090-5862-4
ISBN: 978-1-5090-5863-1
ISBN: 978-1-5090-5861-7
3 S.
International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC) <2017, Graz>
Fraunhofer IAF ()

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.