A 39 W Fully Digital Wideband Inverted Doherty Transmitter

Robert Bootsman, Yiyu Shen, Dieuwert Mul, Mohadig Rousstia, Rob Heeres, Fred van Rijs, John Gajadharsing, Morteza S. Alavi, Leo C.N. de Vreede

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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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.
Original languageEnglish
Title of host publicationProceedings of the 2022 IEEE/MTT-S International Microwave Symposium - IMS 2022
Place of PublicationDenver, CO
PublisherIEEE
Pages979-982
Number of pages4
ISBN (Electronic)978-1-6654-9613-1
ISBN (Print)978-1-6654-9614-8
DOIs
Publication statusPublished - 2022
Event2022 IEEE/MTT-S
International Microwave Symposium
- Denver, United States
Duration: 19 Jun 202224 Jun 2022

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
Volume2022-June
ISSN (Print)0149-645X

Conference

Conference2022 IEEE/MTT-S
International Microwave Symposium
Country/TerritoryUnited States
CityDenver
Period19/06/2224/06/22

Bibliographical note

Accepted author manuscript

Keywords

  • digital transmitters
  • LDMOS
  • CMOS
  • inverted Doherty
  • wideband

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