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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Fully Integrated HBT MMIC Series-Type Extended Doherty Amplifier for W-CDMA Handset Applications

  • Koo, Chan-Hoe (School of Electrical Engineering and Computer Science, Seoul National University) ;
  • Kim, Jung-Hyun (School of Electrical Engineering and Computer Science, Hanyang University) ;
  • Kwon, Young-Woo (School of Electrical Engineering and Computer Science, Seoul National University)
  • Received : 2009.08.28
  • Accepted : 2009.10.13
  • Published : 2010.02.28
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Abstract

A highly efficient linear and compactly integrated series-type Doherty power amplifier (PA) has been developed for wideband code-division multiple access handset applications. To overcome the size limit of a typical Doherty amplifier, all circuit elements, such as matching circuits and impedance transformers, are fully integrated into a single monolithic microwave integrated circuit (MMIC). The implemented PA shows a very low idle current of 25 mA and an excellent power-added efficiency of 25.1% at an output power of 19 dBm by using an extended Doherty concept. Accordingly, its average current consumption was reduced by 51% and 41% in urban and suburban environments, respectively, when compared with a class-AB PA. By adding a simple predistorter to the PA, the PA showed an adjacent channel leakage ratio better than -42 dBc over the whole output power range.

Keywords

References

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