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Authors:
Yan Li
Jerry Lopez
Donald Y.C. Lie
Keywords: Broadband wireless; envelope modulator; envelope-tracking (ET); LTE; SiGe; power amplifier (PA); WiMAX
Abstract:
This work presents a design example of a wideband envelope modulator (EM) that can effectively modulate the instantaneous supply voltage for a monolithic SiGe power amplifier to form a highly efficient envelope-tracking power amplifier (ET-PA) system for potential broadband wireless applications. Trade-offs between linearity, switching noise, efficiency and bandwidth have been examined carefully with both experimental data and RF/analog/digital co-simulations. The SiGe ET-PA using our wideband EM was characterized by the WiMAX 64QAM 8.75 MHz signal, showing an overall PAE of 30.5% at output power of 17 dBm with an error vector magnitude (EVM) of 4.4%, while successfully passing the stringent WiMAX spectral mask.
Pages: 76 to 83
Copyright: Copyright (c) IARIA, 2014
Publication date: June 22, 2014
Published in: conference
ISSN: 2308-4219
ISBN: 978-1-61208-347-6
Location: Seville, Spain
Dates: from June 22, 2014 to June 26, 2014