A 155W −95.6 dB THD+N GaN-based Class-D Audio Amplifier With LC Filter Nonlinearity Compensation

Minggang Chen, Huajun Zhang, Qinwen Fan

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

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Abstract

Silicon MOSFETs-based medium-power (< 50W) Class-D amplifiers (CDAs) switching in the MHz range have gained popularity in recent years, which achieves better linearity thanks to a higher loop gain in the audio band while enabling the use of LC filters with higher cut-off frequencies. However, for high-power (>100 W) CDAs, such switching frequency and high load current could lead to significant power loss. Furthermore, in the presence of a large current and voltage applied to the load, the linearity of the system can quickly degrade due to LC filter component voltage/current dependency. Without any LC filter nonlinearity compensation technique, LC components with high voltage/current rating must be used to reach high system linearity, which are often expensive and bulky. This paper presents a CDA using a GaN-based output stage to achieve high switching frequency and good efficiency simultaneously, and an integrated controller implemented in a 180nm CMOS technology to compensate for the LC filter nonlinearity. Switching at 1.8 MHz, the CDA can deliver a maximum of 155W from a 50V supply into a $4\Omega$ load with a peak efficiency of 91.7%. It achieves a peak THD+N of −95.6 dB (0.0017%) while allowing the use of cheaper and smaller nonlinear LC components.
Original languageEnglish
Title of host publicationProceedings of the 2023 IEEE Applied Power Electronics Conference and Exposition (APEC)
Place of PublicationDanvers
PublisherIEEE
Pages1207-1210
Number of pages4
ISBN (Electronic)978-1-6654-7539-6
ISBN (Print)978-1-6654-7540-2
DOIs
Publication statusPublished - 2023
Event2023 IEEE Applied Power Electronics Conference and Exposition (APEC) - Orlando, United States
Duration: 19 Mar 202323 Mar 2023

Conference

Conference2023 IEEE Applied Power Electronics Conference and Exposition (APEC)
Country/TerritoryUnited States
CityOrlando
Period19/03/2323/03/23

Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • Audio power amplifier
  • Class-D amplifier
  • GaN
  • THD
  • feedback-after-LC

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