SiGe class-E power amplifier with envelope tracking for mobile WiMAX/Wibro applications

In this paper, we report both circuits design and system simulations using highly-efficient monolithic SiGe class-E power amplifier (PA) with an open-loop envelope tracking (ET) technique for mobile WiMAX/Wibro applications. The 1-stage and 2-stage class-E PAs were designed and fabricated in a 0.18...

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Bibliographic Details
Published in2009 IEEE International Symposium on Circuits and Systems (ISCAS) pp. 2017 - 2020
Main Authors Yan Li, Lopez, J., Lie, D.Y.C., Chen, K., Wu, S., Tzu-Yi Yang
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.05.2009
Subjects
BiCMOS integrated circuits
Circuit simulation
Circuit synthesis
Germanium silicon alloys
High power amplifiers
Power amplifiers
Power generation
Power measurement
Silicon germanium
WiMAX
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Summary:In this paper, we report both circuits design and system simulations using highly-efficient monolithic SiGe class-E power amplifier (PA) with an open-loop envelope tracking (ET) technique for mobile WiMAX/Wibro applications. The 1-stage and 2-stage class-E PAs were designed and fabricated in a 0.18 mum BiCMOS SiGe technology. The 1-stage class-E PA achieved peak power added efficiency (PAE) of 62% at output power of 21 dBm in single-tone measurement. The design of linear-assisted switching envelope amplifier is also discussed, which involves balancing the tradeoff between efficiency and signal fidelity. Detailed co-design system simulations including RF circuits and digital DSP blocks show that our class-E PA can be linearized by the open-loop ET technique, and the entire ET-based transmit (TX) system meets the stringent 802.16e TX mask with ~33% overall average efficiency at output power of 18.5 dBm.
ISBN:1424438276
9781424438273
ISSN:0271-4302
2158-1525
DOI:10.1109/ISCAS.2009.5118188