Design of an 87% Fractional Bandwidth Doherty Power Amplifier Supported by a Simplified Bandwidth Estimation Method

Jorge Julian Moreno Rubio; Vittorio Camarchia; Marco Pirola; Roberto Quaglia

doi:10.1109/TMTT.2017.2767586

Design of an 87% Fractional Bandwidth Doherty Power Amplifier Supported by a Simplified Bandwidth Estimation Method

Jorge Julian Moreno Rubio, Vittorio Camarchia, Marco Pirola, Roberto Quaglia

Research output: Contribution to journal › Article › peer-review

Abstract

This paper presents a novel technique for the design of broadband Doherty power amplifiers (DPAs), supported by a simplified approach for the initial bandwidth estimation that requires linear simulations only. The equivalent impedance of the Doherty inverter is determined by the value of the output capacitance of the power device, and the Doherty combiner is designed following this initial choice and using a microstrip network. A GaN-based single-input DPA designed adopting this method exhibits, on a state-of-the-art bandwidth of 87% (1.5-3.8 GHz), a measured output power of around 20 W with 6 dB back-off efficiency between 33% and 55%, with a gain higher than 10 dB. System-level measurements prove the linearizability of the designed Doherty amplifier when a modulated signal is applied.

Original language	English
Article number	8125144
Pages (from-to)	1319-1327
Number of pages	9
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	66
Issue number	3
DOIs	https://doi.org/10.1109/TMTT.2017.2767586
Publication status	Published - 1 Mar 2018
Externally published	Yes

Keywords

Bandwidth
Estimation
Impedance
Broadband communication
Harmonic analysis
Inverters
Power generation

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10.1109/TMTT.2017.2767586

https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8125144

Cite this

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title = "Design of an 87% Fractional Bandwidth Doherty Power Amplifier Supported by a Simplified Bandwidth Estimation Method",

abstract = "This paper presents a novel technique for the design of broadband Doherty power amplifiers (DPAs), supported by a simplified approach for the initial bandwidth estimation that requires linear simulations only. The equivalent impedance of the Doherty inverter is determined by the value of the output capacitance of the power device, and the Doherty combiner is designed following this initial choice and using a microstrip network. A GaN-based single-input DPA designed adopting this method exhibits, on a state-of-the-art bandwidth of 87% (1.5-3.8 GHz), a measured output power of around 20 W with 6 dB back-off efficiency between 33% and 55%, with a gain higher than 10 dB. System-level measurements prove the linearizability of the designed Doherty amplifier when a modulated signal is applied.",

keywords = "Bandwidth, Estimation, Impedance, Broadband communication, Harmonic analysis, Inverters, Power generation",

author = "{Moreno Rubio}, {Jorge Julian} and Vittorio Camarchia and Marco Pirola and Roberto Quaglia",

year = "2018",

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doi = "10.1109/TMTT.2017.2767586",

language = "English",

volume = "66",

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T1 - Design of an 87% Fractional Bandwidth Doherty Power Amplifier Supported by a Simplified Bandwidth Estimation Method

AU - Moreno Rubio, Jorge Julian

AU - Camarchia, Vittorio

AU - Pirola, Marco

AU - Quaglia, Roberto

PY - 2018/3/1

Y1 - 2018/3/1

N2 - This paper presents a novel technique for the design of broadband Doherty power amplifiers (DPAs), supported by a simplified approach for the initial bandwidth estimation that requires linear simulations only. The equivalent impedance of the Doherty inverter is determined by the value of the output capacitance of the power device, and the Doherty combiner is designed following this initial choice and using a microstrip network. A GaN-based single-input DPA designed adopting this method exhibits, on a state-of-the-art bandwidth of 87% (1.5-3.8 GHz), a measured output power of around 20 W with 6 dB back-off efficiency between 33% and 55%, with a gain higher than 10 dB. System-level measurements prove the linearizability of the designed Doherty amplifier when a modulated signal is applied.

AB - This paper presents a novel technique for the design of broadband Doherty power amplifiers (DPAs), supported by a simplified approach for the initial bandwidth estimation that requires linear simulations only. The equivalent impedance of the Doherty inverter is determined by the value of the output capacitance of the power device, and the Doherty combiner is designed following this initial choice and using a microstrip network. A GaN-based single-input DPA designed adopting this method exhibits, on a state-of-the-art bandwidth of 87% (1.5-3.8 GHz), a measured output power of around 20 W with 6 dB back-off efficiency between 33% and 55%, with a gain higher than 10 dB. System-level measurements prove the linearizability of the designed Doherty amplifier when a modulated signal is applied.

KW - Bandwidth

KW - Estimation

KW - Impedance

KW - Broadband communication

KW - Harmonic analysis

KW - Inverters

KW - Power generation

UR - https://ieeexplore.ieee.org/document/8125144/

U2 - 10.1109/TMTT.2017.2767586

DO - 10.1109/TMTT.2017.2767586

M3 - Article

SN - 1557-9670

VL - 66

SP - 1319

EP - 1327

JO - IEEE Transactions on Microwave Theory and Techniques

JF - IEEE Transactions on Microwave Theory and Techniques

IS - 3

M1 - 8125144

ER -

Design of an 87% Fractional Bandwidth Doherty Power Amplifier Supported by a Simplified Bandwidth Estimation Method

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Keywords

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