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A 2.4-GHz, 27-dBm Asymmetric Multilevel Outphasing Power Amplifier in 65-nm CMOS

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5 Author(s)
Philip A. Godoy ; Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, USA ; SungWon Chung ; Taylor W. Barton ; David J. Perreault
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We present a 2.4-GHz asymmetric multilevel outphasing (AMO) power amplifier (PA) with class-E branch amplifiers and discrete supply modulators integrated in a 65-nm CMOS process. AMO PAs achieve improved modulation bandwidth and efficiency over envelope tracking (ET) PAs by replacing the continuous supply modulator with a discrete supply modulator implemented with a fast digital switching network. Outphasing modulation is used to provide the required fine output envelope control. The AMO PA delivers 27.7-dBm peak output power with 45% system efficiency at 2.4 GHz. For a 20-MHz WLAN OFDM signal with 7.5-dB PAPR, the AMO PA achieves a drain efficiency of 31.9% and a system efficiency of 27.6% with an EVM of 2.7% rms.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:47 ,  Issue: 10 )