Digital predistortion linearization of a GaN HEMT push-pull power amplifier for cable applications with high fractional bandwidth

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URI: https://hdl.handle.net/10902/29777
ISSN: 0018-9316
ISSN: 1557-9611
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Autoría
Gilabert Pinal, Pere Lluis; Pérez Cisneros, José Ramón; Ren, Zhixiong; Montoro López, Gabriel; Ruiz Lavín, María de las NievesAutoridad Unican; García García, José ÁngelAutoridad Unican
Fecha
2023-06
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© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Publicado en
IEEE Transactions on Broadcasting, 2023, 69(2), 516-527
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Institute of Electrical and Electronics Engineers Inc.
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Palabras clave
Digital predistortion
Fractional bandwidth
Push-pull power amplifier
Power efficiency
Resumen/Abstract
This paper presents two linearization strategies for a custom-designed wideband push-pull (PP) power amplifier (PA) for wired communication applications such as, for example, cable TV. Two digital predistortion (DPD) behavioral models are proposed to meet the in-band and out-of-band linearity requirements when efficiently amplifying wideband DOCSIS signals with high fractional bandwidth (FBW). A radiofrequency (RF) DPD linearizer based on a band-pass generalized memory polynomial (BP-GMP) behavioral model and a baseband (BB) I-Q DPD linearizer based on a harmonic distortion GMP (HD-GMP) behavioral model are proposed. Both DPD models take into account the harmonic distortion typical of high FBW amplification. Experimental results will show high efficient and linear amplification of a 4×192 MHz composite DOCSIS signal by properly combining a crest factor reduction (CFR) technique and the proposed DPD strategies.
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