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 language | English |
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Title of host publication | Proceedings of the 2023 IEEE Applied Power Electronics Conference and Exposition (APEC) |
Place of Publication | Danvers |
Publisher | IEEE |
Pages | 1207-1210 |
Number of pages | 4 |
ISBN (Electronic) | 978-1-6654-7539-6 |
ISBN (Print) | 978-1-6654-7540-2 |
DOIs | |
Publication status | Published - 2023 |
Event | 2023 IEEE Applied Power Electronics Conference and Exposition (APEC) - Orlando, United States Duration: 19 Mar 2023 → 23 Mar 2023 |
Conference
Conference | 2023 IEEE Applied Power Electronics Conference and Exposition (APEC) |
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Country/Territory | United States |
City | Orlando |
Period | 19/03/23 → 23/03/23 |
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-careOtherwise 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