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High efficiency GaN current-mode class-D amplifier at 2.6 GHz using pure differential transmission line filters

High efficiency GaN current-mode class-D amplifier at 2.6 GHz using pure differential transmission line filters

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In class-D operation the impedances of the output network at each harmonic frequency at the intrinsic terminals of the transistors are of main importance. This reported work demonstrates a new concept using pure differential transmission line filters for the matching of these impedances. Furthermore, de-embedding techniques are used to compensate the impedance transforming characteristics of the package parasitics. A current-mode class-D (CMCD) amplifier with a power-added efficiency (PAE) of 62% and a corresponding output power of 29.5 W at 2.6 GHz has been demonstrated. To the authors' knowledge, these are the highest reported values of the PAE as well as the output power at this frequency for a CMCD.

References

    1. 1)
      • Al Tanany, A., Sayed, A., Boeck, G.: `A 2.14 GHz 50 Watt 60% power added efficiency GaN current mode class D power amplifier', Proc. of 38th European Microwave Conf., 2008, Amsterdam, The Netherlands, p. 432–435.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2012.3984
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