Analysis and Design of Highly Efficient Wideband RF-Input Sequential Load Modulated Balanced Power Amplifier

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Title: Analysis and Design of Highly Efficient Wideband RF-Input Sequential Load Modulated Balanced Power Amplifier
Authors: Pang, JingzhouLi, YueLi, MengZhang, YikangZhou, Xin YuDai, ZhijiangZhu, Anding
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Date: May-2020
Online since: 2020-11-26T11:32:47Z
Abstract: The analysis and design of an RF-input sequential load modulated balanced power amplifier (SLMBA) are presented in this article. Unlike the existing LMBAs, in this new configuration, an over-driven class-B amplifier is used as the carrier amplifier while the balanced PA pair is biased in class-C mode to serve as the peaking amplifier. It is illustrated that the sequential operation greatly extends the high-efficiency power range and enables the proposed SLMBA to achieve high back-off efficiency across a wide bandwidth. An RF-input SLMBA at 3.05-3.55-GHz band using commercial GaN transistors is designed and implemented to validate the proposed architecture. The fabricated SLMBA attains a measured 9.5-10.3-dB gain and 42.3-43.7-dBm saturated power. Drain efficiency of 50.9-64.9/ 46.8-60.7/43.2-51.4% is achieved at 6-/8-/10-dB output power back-off within the designed bandwidth. By changing the bias condition of the carrier device, higher than 49.1% drain efficiency can be obtained within the 12.8-dB output power range at 3.3 GHz. When driven by a 40-MHz orthogonal frequency-division multiplexing (OFDM) signal with 8-dB peak-to-average power ratio (PAPR), the proposed SLMBA achieves adjacent channel leakage ratio (ACLR) better than -25 dBc with an average efficiency of 63.2% without digital predistortion (DPD). When excited by a ten-carrier 200-MHz OFDM signal with 10-dB PAPR, the average efficiency can reach 48.2% and -43.9-dBc ACLR can be obtained after DPD.
Funding Details: European Commission Horizon 2020
Science Foundation Ireland
Funding Details: Trinity College Dublin (TCD)
Type of material: Journal Article
Publisher: IEEE
Journal: IEEE Transactions on Microwave Theory and Techniques
Volume: 68
Issue: 5
Start page: 1741
End page: 1753
Copyright (published version): 2020 IEEE
Keywords: 5GHigh efficiencyLoad modulated balance power amplifierSequential power amplifierWideband
DOI: 10.1109/tmtt.2019.2963868
Language: en
Status of Item: Peer reviewed
ISSN: 0018-9480
This item is made available under a Creative Commons License:
Appears in Collections:Electrical and Electronic Engineering Research Collection

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