Doherty amplifier with DSP control to improve performance in CDMA operation

  title={Doherty amplifier with DSP control to improve performance in CDMA operation},
  author={Yu Zhao and Masaya Iwamoto and L. E. Larson and P. M. Asbeck},
  journal={IEEE MTT-S International Microwave Symposium Digest, 2003},
  pages={687-690 vol.2}
A power amplifier for CDMA applications which consists of a Doherty amplifier and a digital signal processing (DSP) controller is presented. DSP is used to dynamically adjust the gate bias of the auxiliary (peaking) amplifier at the rate of the signal envelope to obtain gain flatness (i.e. AM-AM distortion correction). Furthermore, DSP is used as a digital predistortor to improve the overall linearity by adjusting the phase at baseband (i.e. AM-PM distortion correction). The 840 MHz Doherty… CONTINUE READING
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