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Dual-band impedance transformation networks for integrated power amplifiers

Published online by Cambridge University Press:  10 November 2014

Robert Wolf
Affiliation:
Chair for Circuit Design and Network Theory, Technische Universität Dresden, 01062 Dresden, Germany. Phone: +49 351 463 33919
Niko Joram*
Affiliation:
Chair for Circuit Design and Network Theory, Technische Universität Dresden, 01062 Dresden, Germany. Phone: +49 351 463 33919
Stefan Schumann
Affiliation:
Chair for Circuit Design and Network Theory, Technische Universität Dresden, 01062 Dresden, Germany. Phone: +49 351 463 33919
Frank Ellinger
Affiliation:
Chair for Circuit Design and Network Theory, Technische Universität Dresden, 01062 Dresden, Germany. Phone: +49 351 463 33919
*
Corresponding author: N. Joram, Email: niko.joram@tu-dresden.de

Abstract

This paper shows that the two most common impedance transformation networks for power amplifiers (PAs) can be designed to achieve optimum transformation at two frequencies. Hence, a larger bandwidth for the required impedance transformation ratio is achieved. A design procedure is proposed, which takes imperfections like losses into account. Furthermore, an analysis method is presented to estimate the maximum uncompressed output power of a PA with respect to frequency. Based on these results, a fully integrated PA with a dual-band impedance transformation network is designed and its functionality is proven by large signal measurement results. The amplifier covers the frequency band from 450 MHz to 1.2 GHz (3 dB bandwidth of the output power and efficiency), corresponding to a relative bandwidth of more than 100%. It delivers 23.7 dBm output power in the 1 dB compression point, having a power-added efficiency of 33%.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2014 

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References

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