RF IC design of highly-efficient broadband polar transmitters for WiMAX and 3GPP LTE applications

D. Y.C. Lie, Y. Li, J. Lopez, K. Chen, S. Wu, T. Y. Yang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

This paper presents highly-efficient RF polar transmitter (TX) systems that utilize the envelope-tacking (ET) technique with monolithic SiGe power amplifiers (PAs) for mobile WiMAX and 3GPP Long Term Evolution (LTE) applications. Monolithic single-ended cascode SiGe PA design capable of enhancing its power-added efficiency (PAE) is demonstrated. Four RF switches are adopted at the bases of the common-emitter transistors, which can be turned on/off in response to the desired output power. We found that self-biasing of the common-base device with ET can improve the output distortion of the cascode PA to output 18dBm and passing the stringent mobile WiMAX linearity specs with 30% PAE at 2.3GHz without predistortion. Furthermore, a differential cascode SiGe PA using the proposed ET-based polar TX system can improve the average output power to 21dBm with 33.6% PAE at 1.42 GHz, and it also passes the stringent LTE 16QAM linearity specs without needing predistortion.

Original languageEnglish
Title of host publicationICSICT-2010 - 2010 10th IEEE International Conference on Solid-State and Integrated Circuit Technology, Proceedings
Pages150-153
Number of pages4
DOIs
StatePublished - 2010
Event2010 10th IEEE International Conference on Solid-State and Integrated Circuit Technology - Shanghai, China
Duration: Nov 1 2010Nov 4 2010

Publication series

NameICSICT-2010 - 2010 10th IEEE International Conference on Solid-State and Integrated Circuit Technology, Proceedings

Conference

Conference2010 10th IEEE International Conference on Solid-State and Integrated Circuit Technology
CountryChina
CityShanghai
Period11/1/1011/4/10

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