By Topic

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

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

5 Author(s)
Yu Zhao ; Dept. of Electr. & Comput. Eng., California Univ., La Jolla, CA ; Metzger, A. ; Zampardi, P.J. ; Iwamoto, M.
more authors

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 measured gain and phase agree with the simulation results, and the IMD3 performance is improved as much as 8dB when compared with a Doherty PA without phase delay tuning

Published in:

Microwave Symposium Digest, 2006. IEEE MTT-S International

Date of Conference:

11-16 June 2006