Efficiency and Linearity of Digital Class-C like Transmitters

Dieuwert P.N. Mul, Rob J. Bootsman, Quinten Bruinsma, Yiyu Shen, Sebastian Krause, Rudiger Quay, Marco J. Pelk, Morteza Alavi, Leo C.N. De Vreede, More Authors

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

Abstract

An energy-efficient, intrinsically linear, digital class-C like operation-mode is investigated for use in high-power digital transmitters (DTXs), which target next generation mMIMO base stations that offer lower costs, higher integration, and improved system efficiency. The proposed operation utilizes class-B/C output matching in combination with duty-cycle reduction and current-mode operation of a segmented output stage. Its performance in terms of efficiency, output power, and linearity is benchmarked with analog class-B/C operation. The proposed digital class-C like operation has been experimentally verified using a fully-digital, dual TX line-up with VT-shifted segmented LDMOS output stages. All output stage segments are individually controlled by high-speed digital drivers implemented in 40 nm CMOS technology. The realized prototype provides 25.9 W (CW) output power with 75.7 % drain and 72.9 % system efficiencies, at 930 MHz and at 28 V drain supply.

Original languageEnglish
Title of host publication2020 50th European Microwave Conference, EuMC 2020
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages471-474
Number of pages4
ISBN (Electronic)9782874870590
DOIs
Publication statusPublished - 2021
Event50th European Microwave Conference, EuMC 2020 - Utrecht, Netherlands
Duration: 12 Jan 202114 Jan 2021

Publication series

Name2020 50th European Microwave Conference, EuMC 2020

Conference

Conference50th European Microwave Conference, EuMC 2020
CountryNetherlands
CityUtrecht
Period12/01/2114/01/21

Keywords

  • Class-C
  • CMOS RFIC
  • digital power amplifier
  • digital transmitter
  • efficiency
  • LDMOS
  • linearity
  • polar transmitter
  • RFDAC

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