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Linearity Improvement ofHBT-based Doherty Power Amplifiers Based on a Simple Analytical Model
 

Summary: 877
Linearity Improvement ofHBT-based Doherty Power Amplifiers
Based on a Simple Analytical Model
Yu Zhao', Andre Metzger2, Peter J. Zampardi2, Masaya Iwamoto3, and Peter M. Asbeck'
1. Electrical and Computer Engineering Department, University of California, San Diego, La Jolla, CA
2. Skyworks Solutions Inc, Newbury Park, CA
3. Agilent Technologies, Santa Rosa, CA94953
Abstract - A simple analytical model is proposed and shown
to be effective in predicting the nonlinear behavior of single-
ended amplifiers as well as Doherty amplifiers implemented
with GaAs HBTs for handset applications. The analytical
model is based on linear and nonlinear components extracted
from a VBIC model for Skyworks InGaP/GaAs HBT devices.
Equations derived from the model provide insights into effects
of individual components on the gain and phase of the
amplifier. It is found that tuning the phase delay inserted in
front of the auxiliary PA within the Doherty can improve
linearity at high input power. The efficacy of the model is
demonstrated by experimental results, in which for a Doherty
PA with a tuned phase delay at the auxiliary PA side, the

  

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

 

Collections: Engineering