A -107.8 dB THD+N Low-EMI Multi-Level Class-D Audio Amplifier

Huajun Zhang, Shoubhik Karmakar, Lucien Breems, Quino Sandifort, Marco Berkhout, Kofi Makinwa, Qinwen Fan

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


This paper describes a class-D audio amplifier with a multilevel output stage that reduces both EMI and idle power. High loop gain, and thus high linearity, are enabled by a relatively high (4.2 MHz) switching frequency, which relaxes the requirements on its output LC filter. Fabricated in a 180nm BCD technology, it can drive 14 W into an 8-Ω load with state-of-the-art performance: -107.8 dB THD+N, 91% peak efficiency, and 7 mA quiescent current. It meets the CISPR 25 Class 5 radiated emission standard with a low-cost 580 kHz LC filter, improving the state-of-the-art by 5.8x.

Original languageEnglish
Title of host publication2020 IEEE Symposium on VLSI Circuits
Subtitle of host publicationProceedings
Place of PublicationPiscataway
Number of pages2
ISBN (Electronic)978-1-7281-9942-9
ISBN (Print)978-1-7281-9943-6
Publication statusPublished - 2020
Event2020 IEEE Symposium on VLSI Circuits, VLSI Circuits 2020 - Honolulu, United States
Duration: 16 Jun 202019 Jun 2020


Conference2020 IEEE Symposium on VLSI Circuits, VLSI Circuits 2020
CountryUnited States

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