A -109.1 dB/-98 dB THD/THD+N Chopper Class-D Amplifier with >83.7 dB PSRR Over the Entire Audio Band

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3 Citations (Scopus)
99 Downloads (Pure)

Abstract

This paper reports a chopper Class-D audio amplifier that obtains high PSRR over the entire audio band. A chopping scheme is proposed to minimize intermodulation distortion between pulse-width modulation (PWM) and chopping in the audio band. A high-voltage chopper is developed to handle a 14.4 V PWM signal. Timing matching techniques are proposed to minimize chopping nonidealities which ensure good PSRR and THD. Fabricated in a 180nm BCD process, the prototype obtains a PSRR >109 dB at 217 Hz and >83.7 dB over the entire audio band. It also achieves -109.1 dB/-98 dB THD/THD+N and can deliver a maximum of 13 W to an 8-Ω load.
Original languageEnglish
Title of host publicationESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference (ESSCIRC)
Subtitle of host publicationProceedings
Place of PublicationDanvers
PublisherIEEE
Pages395-398
Number of pages4
ISBN (Electronic)978-1-6654-3751-6
ISBN (Print)978-1-6654-3752-3
DOIs
Publication statusPublished - 2021
EventESSCIRC 2021: IEEE 47th European Solid State Circuits Conference - Virtual at Grenoble, France
Duration: 6 Sept 20219 Sept 2021
Conference number: 47th

Conference

ConferenceESSCIRC 2021
Country/TerritoryFrance
CityVirtual at Grenoble
Period6/09/219/09/21

Bibliographical note

Accepted author manuscript

Keywords

  • Class-D amplifier
  • PSRR
  • PWM
  • chopping
  • intermodulation

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