JEE_V1_N4_RP2 Yan Li Jerry Lopez Donald Y.C. Lie Journal on Electrical Engineering 2230 – 7176 1 4 15 21 Power amplifier linearization, Quasi class E, SiGe PA, Cann's model, Envelope tracking, Envelope elimination and restoration, time mismatching A modified bias-dependent Cann’s model and performed IC design and hardware experiments to study the linearization of a highly-efficient monolithic quasi-class E SiGe power amplifier (PA) IC using both Envelope-Tracking (ET) and Envelope-Elimination-and-Restoration (EER) techniques. Our PA behavior model fits the measured SiGe PA IC data very well across a wide range of bias and supply voltages. Both measurement and simulations show that the ET-linearized PA system is significantly less sensitive to the timing misalignment between the amplitude and the RF signal path than the EER-linearized PA system. Our experimental results also prove that ET successfully linearized the SiGe PA to pass the stringent EDGE transmit mask at 900MHz, while EER could not. Simulations based on our PA behavior model predict that the optimal timing alignment for ET linearization can be achieved at PA base bias voltage Vbb=0.55-0.6V, which is consistent with our measurement results as well. April - June 2008 Copyright © 2008 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=371