TY - JOUR
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 -