Dynamic Feedback Linearizer of RF CMOS Power Amplifier

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A dynamic feedback linearizer for an RF CMOS power amplifier (PA) is presented, which consists of a negative feedback network and a dynamic feedback control circuit to inject a reshaped envelope signal to the network. The linearizer compensates for the gain compression of the RF CMOS PA in high-power region by reducing the feedback dynamically, and it also reduces the amplitude-to-phase modulation (AM-PM) distortions. The PA including the linearizer was fabricated using a 0.18-mu m RF CMOS process, which has an output transmission-line transformer on a printed circuit hoard. It delivers an output power of 28.1 dBm at 1.7 GHz with power added efficiency of 40.9%, and adjacent channel leakage ratio (ACLR(E-UTRA)) of under -30 dBc for a 10-MHz 16-QAM long-term evolution signal without digital predistortions.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2018-10
Language
English
Article Type
Article
Keywords

DISTORTION; LTE

Citation

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, v.28, no.10, pp.915 - 917

ISSN
1531-1309
DOI
10.1109/LMWC.2018.2861881
URI
http://hdl.handle.net/10203/246328
Appears in Collection
EE-Journal Papers(저널논문)
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