An 18.5 W Fully-Digital Transmitter with 60.4 % Peak System Efficiency

Bootsman, Rob; Mul, Dieuwert; Shen, Yiyu; Heeres, R.M.; Rijs, F. van; Alavi, Morteza S.; Vreede, L.C.N. de

doi:10.1109/ims30576.2020.9223942

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…Digital transmitters (DTXs) offer promising benefits over traditional analog transmitters (TXs): namely, they do not require any input impedance matching or quiescent currents for their output stages. Furthermore, they completely eliminate stability issues and are flexible in their activation profile and output matching [1,2]. Consequently, the DTX concept can offer very high system efficiencies, especially at power back-off (PBO), while its RF bandwidth (BW) is only limited by the design of the applied output matching network.…”

Section: Introductionmentioning

confidence: 99%

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A 39 W Fully Digital Wideband Inverted Doherty Transmitter

Bootsman

Shen

Mul

et al. 2022

2022 IEEE/MTT-S International Microwave Symposium - IMS 2022

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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.

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Section: Introductionmentioning

confidence: 99%

“…In the work of [2] and [3], focus was placed on achieving high DTX RF output power and peak efficiency; however, neither works offer enhanced efficiency in PBO, nor high RF BW. With this work, we present world's first fully-digital high-power Doherty transmitter (P out > 39 W).…”

Section: Introductionmentioning

confidence: 99%

A 39 W Fully Digital Wideband Inverted Doherty Transmitter

Bootsman

Shen

Mul

et al. 2022

2022 IEEE/MTT-S International Microwave Symposium - IMS 2022

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“…More importantly, the controller's power consumption is (linearly) proportional to its RF output voltage, enabling high TX system efficiencies that can offer dramatic power savings in standby or low traffic conditions. This article explores the feasibility of such a high-power DTX approach with its underlying technology and design challenges (Sections II and III), providing an extended, more detailed description of the work published in [8]. Section IX gives the DTX realization and its static and dynamic measurement results, demonstrating its high output power and system efficiency.…”

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confidence: 99%

High-Power Digital Transmitters for Wireless Infrastructure Applications (A Feasibility Study)

Bootsman

Mul

Shen

et al. 2022

IEEE Trans. Microwave Theory Techn.

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Fully digital transmitters (DTXs) have the potential of replacing analog-intensive transmitter (TX) line-ups in future massive multiple-input and multiple-output (mMIMO) systems since they hold the promise of higher system integration level and energy efficiency. DTX operation so far has been limited to low RF output powers. This article introduces a concept that enables high-power DTX operation. A DTX demonstrator targeting both high output power and high efficiency is realized as a proof of concept. It is based on a custom V T -shifted laterally-diffused MOS (LDMOS) technology, which is utilized to implement a segmented high-power output stage operated in class-BE. A lowvoltage high-speed 40-nm CMOS controller drives the individual output stage segments at gigahertz rates. Measurements show the promising results for the proposed high-power DTX concept and provide valuable lessons for future DTX implementations.

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Semiconductors and Semiconductor Devices and Circuits

Quay

2023

Fundamentals of RF and Microwave Techniques and Technologies

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An 18.5 W Fully-Digital Transmitter with 60.4 % Peak System Efficiency

Cited by 5 publications

References 8 publications

A 39 W Fully Digital Wideband Inverted Doherty Transmitter

A 39 W Fully Digital Wideband Inverted Doherty Transmitter

High-Power Digital Transmitters for Wireless Infrastructure Applications (A Feasibility Study)

Semiconductors and Semiconductor Devices and Circuits

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