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A 31.5dBm outphasing class-D power amplifier in 45nm CMOS with back-off efficiency enhancement by dynamic power control

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7 Author(s)
Wei Tai ; Carnegie Mellon Univ., Pittsburgh, PA, USA ; Hongtao Xu ; Ravi, A. ; Lakdawala, H.
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A transformer-combined fully Integrated outphasing class-D PA In 45nm CMOS achieves 31.5dBm peak output power at 2.4GHz with 27% efficiency, and supports over 86dB of output power range. The PA employs Dynamic Power Control (DPC) whereby sections of the PA are turned on-off dynamically according to the OFDM amplitude to reduce power dissipation at backoff. The PA delivers 24.8dBm average power while meeting 64-QAM WLAN requirements. PAE is 16% when using DPC, which represents a 33% efficiency enhancement compared to the DPC-disabled mode. At lower average power of 20.5dBm, DPC enables a 140% enhancement in average efficiency, hence battery life.

Published in:

ESSCIRC (ESSCIRC), 2011 Proceedings of the

Date of Conference:

12-16 Sept. 2011