A novel Doherty amplifier for enhanced load modulation and higher bandwidth

  title={A novel Doherty amplifier for enhanced load modulation and higher bandwidth},
  author={Mehdi Sarkeshi and Ooi Ban Leong and Arthur H. M. van Roermund},
  journal={2008 IEEE MTT-S International Microwave Symposium Digest},
We are reporting a new topology for the Doherty amplifier to increase its bandwidth and enhance the load modulation. A varactor-based impedance transformer has been employed to replace the bulky and narrowband quarter-wave impedance inverter. Load modulation is carried out adaptively using the proposed varactor-based structure based on the input power level. An envelope detector is employed for adaptive impedance transformation of the carrier amplifier as well as bias adaptation of the peak… CONTINUE READING
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