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Doherty Amplifier with DSP Control to Improve Performance in CDMA Operation
 

Summary: WE3A-1
Doherty Amplifier with DSP Control to Improve Performance in
CDMA Operation
BE
Yu Zhao, Masaya Iwamoto, Lawrence E. Larson, and Peter M. Asbeck
Dept. of Electrical and Computer Engineering, University of California at San Diego, La Jolla, CA
Abstract - 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 840MHz Doherty amplifier is
realized with two commercially available MESFETs in a
hybrid circuit, and the DSP is implemented externally with a
board controlledby a personal computer. It is shown that by
utilizing these DSP techniques, the overall linearity and
efficiency characteristics of the Doherty amplifier can be

  

Source: Asbeck, Peter M. - Department of Electrical and Computer Engineering, University of California at San Diego

 

Collections: Engineering