Analysis and Design of Highly Efficient Wideband RF-Input Sequential Load Modulated Balanced Power Amplifier
|Title:||Analysis and Design of Highly Efficient Wideband RF-Input Sequential Load Modulated Balanced Power Amplifier||Authors:||Pang, Jingzhou; Li, Yue; Li, Meng; Zhang, Yikang; Zhou, Xin Yu; Dai, Zhijiang; Zhu, Anding||Permanent link:||http://hdl.handle.net/10197/11748||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:||5G; High efficiency; Load modulated balance power amplifier; Sequential power amplifier; Wideband||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:||https://creativecommons.org/licenses/by-nc-nd/3.0/ie/|
|Appears in Collections:||Electrical and Electronic Engineering Research Collection|
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