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Predistortion of a 100‐W base station high‐power amplifiers
Author(s) -
Sun X. L.,
Cheung S. W.,
Yuk T. I.
Publication year - 2011
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.25855
Subject(s) - intermodulation , predistortion , amplifier , signal (programming language) , electronic engineering , base station , electrical engineering , engineering , distortion (music) , microwave , power (physics) , telecommunications , computer science , physics , cmos , quantum mechanics , programming language
This article presents the design of a fifth‐order RF predistorter for use in a base‐station high‐power amplifier (HPA).The predistorter uses two intermodulation (IM) signal generators, with identical configuration, to individually generate the third‐ and fifth‐order inband intermodulation (IM3 and IM5) signals for cancellation of the third‐ and fifth‐order intermodulation distortion products (IMDP3 and IMDP5) at the output of the HPA. The IM signal generators are constructed using two Schottky diodes as non‐linear devices to generate the inband IM3 and IM5 signals. The proposed predistorter is designed and optimized using computer simulation. A hardware prototype is built and tested in a practical 100‐W HPA using a standard IS‐95 CDMA signal at 2.2 GHz. Measured results show that the spectral regrowth of the signal at the HPA output can be significantly suppressed over a wide range of output power levels. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:861–867, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25855