A 39 W Fully Digital Wideband Inverted Doherty Transmitter

Conference paper (2022)

Authors

R.J. Bootsman Electronics - EEMCS
Y. Shen Electronics - EEMCS , Broadcom Netherlands B.V.
D.P.N. Mul Electronics - EEMCS
Mohadig Rousstia Ampleon Netherlands B.V.
Rob Heeres Ampleon Netherlands B.V.
Fred van Rijs Ampleon Netherlands B.V.
John Gajadharsing Ampleon Netherlands B.V.
S.M. Alavi Electronics - EEMCS
L.C.N. de Vreede Electronics - EEMCS
Research Group
Electronics (EEMCS) (TU Delft)
Copyright: © 2022 R.J. Bootsman, Y. Shen, D.P.N. Mul, Mohadig Rousstia, Rob Heeres, Fred van Rijs, John Gajadharsing, S.M. Alavi, L.C.N. de Vreede
DOI: https://doi.org/10.1109/IMS37962.2022.9865405
Wideband CMOS LDMOS Digital transmitters Inverted Doherty
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Published Date

2022

Language

English

Reuse Rights

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronics

Abstract

A high-power fully-digital Doherty transmitter (DDTX) is proposed. It features two segmented LDMOS output switch banks implemented in a custom V T -down-shifted LDMOS technology. A 40 nm CMOS controller digitally activates the individual LDMOS gate segments of the output stage at RF speed. An inverted Doherty power combiner is proposed that features non-short circuited 2 nd harmonic conditions for the main and peak switch banks to boost the RF bandwidth. To guarantee smooth output power and efficiency vs. frequency, a 2 nd harmonic trap is introduced in the power combiner, yielding an RF bandwidth of > 400 MHz. The realized demonstrator can achieve over 39 W peak output power. Its highest drain and system efficiencies, respectively 60 % and 57 %, were found at 34.2 W of output power, while in power back-off its peak drain and system efficiencies are 52 % and 48 % respectively. Over a 25 dB output range, the system efficiency is within 4 percent points of the drain efficiency.