Title: Transformer-Based Uneven Doherty Power Amplifier in 90 nm CMOS for WLAN Applications
Authors: Kaymaksut, Ercan ×
Reynaert, Patrick #
Issue Date: 1-Jul-2012
Publisher: Institute of Electrical and Electronics Engineers
Series Title: IEEE Journal of Solid-State Circuits vol:47 issue:7 pages:1659-1671
Abstract: This paper presents a fully integrated transformer-
based Doherty power amplifier ina standard 90 nmCMOS
process. A novel asymmetrical series combining transformer is
used to achieve uneven Doherty operation. The transformer-based
uneven Doherty architecture is analyzed to further improve the
back-off efficiency without linearity degradation. The fabricated
two-stage uneven Doherty PA achieves a maximum output power
of 26.3 dBm at 2.4 GHz with a peak power added efficiency (PAE)
of 33% at 2 V supply voltage. The PAE at 6 dB back-off is still
as high as 25.1%. The PA is tested with 54 Mbps WLAN 802.11g
signal and it meets the stringent EVM and spectral mask requirements
at 19.3 dBm average output power with a PAE of 22.9%
with no need of predistortion. An open loop digital predistortion is
applied to further improve the linearity. The PA satisfies WLAN
requirements at 20.2 dBm average output power with a PAE of
24.7% with predistortion.
ISSN: 0018-9200
Publication status: published
KU Leuven publication type: IT
Appears in Collections:ESAT - MICAS, Microelectronics and Sensors
× corresponding author
# (joint) last author

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