Broadband Fully Integrated GaN Power Amplifier With Minimum-Inductance BPF Matching and Two-Transistor AM-PM Compensation

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Title: Broadband Fully Integrated GaN Power Amplifier With Minimum-Inductance BPF Matching and Two-Transistor AM-PM Compensation
Authors: Nikandish, GholamrezaStaszewski, Robert BogdanZhu, Anding
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Date: Dec-2020
Online since: 2021-03-10T16:55:11Z
Abstract: In this paper, we present a design technique for broadband fully integrated GaN power amplifiers (PAs), with merged bandpass filter (BPF) and AM-PM compensation. The minimum-inductance BPF structure is used as the output matching network of the PA. A new theory of the minimum-inductance BPF is developed and it is shown that, compared to the standard BPF, it can be implemented using lower total inductance and provide higher out-of-band attenuation. Furthermore, using a two-transistor architecture, an AM-PM compensation technique is proposed where compressive and expansive nonlinearity profiles of the transistors' transconductance and gate-source capacitance are combined to achieve a linear total transconductance and input capacitance, over a wide power range. A fully integrated PA prototype, implemented in a 0.25- μm GaN-on-SiC process with 28-V supply, provides 35.1-38.9,dBm output power, 45-61% drain efficiency (DE), 40-55% power-added efficiency (PAE), and 11.3-13.4,dB power gain, across 2.0-4.0,GHz. For a 256-QAM signal with 7.2-dB PAPR and 100-MHz bandwidth at 2.4,GHz, it achieves 2.5% (-32.0,dB) rms error vector magnitude (EVMrms) and -37.5/-37.6,dBc adjacent channel leakage ratio (ACLR), while average output power and DE/PAE are respectively 30.1,dBm and 20.6/19.5%, without predistortion. EVMrms and ACLR can be improved to 0.5% (-46,dB) and -46.4/-46.8,dBc by using digital predistortion (DPD).
Funding Details: Science Foundation Ireland
Funding Details: Trinity College Dublin (TCD)
Type of material: Journal Article
Publisher: IEEE
Journal: IEEE Transactions on Circuits and Systems I: Regular Papers
Volume: 67
Issue: 12
Start page: 4211
End page: 4223
Copyright (published version): 2020 IEEE
Keywords: 5GAM-PMBandpass filter (BPF)Broadband amplifierGaNLinearizationPower amplifier (PA)
DOI: 10.1109/tcsi.2020.3002395
Language: en
Status of Item: Peer reviewed
ISSN: 1549-8328
This item is made available under a Creative Commons License:
Appears in Collections:Electrical and Electronic Engineering Research Collection

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