Print Email Facebook Twitter A - 121.5-dB THD Class-D Audio Amplifier With 49-dB LC Filter Nonlinearity Suppression Title A - 121.5-dB THD Class-D Audio Amplifier With 49-dB LC Filter Nonlinearity Suppression Author Zhang, H. (TU Delft Electronic Instrumentation) Berkhout, Marco (Goodix Technologies) Makinwa, K.A.A. (TU Delft Microelectronics) Fan, Q. (TU Delft Electronic Instrumentation) Department Microelectronics Date 2022 Abstract Class-D audio amplifiers produce electromagnetic interference (EMI), which often needs to be suppressed by an external LC filter. However, due to component nonlinearity, this filter can itself cause significant distortion. This article presents a class-D amplifier that suppresses LC filter nonlinearity by 49 dB and is robust to ±30% variations in its cutoff frequency. This is achieved by a dual-loop architecture, in which an inner loop provides stability, while an outer loop provides the high gain needed to suppress the LC filter and output-stage nonlinearity. A prototype, implemented in a 180-nm BCD process, achieves -121.5-dB total harmonic distortion (THD) and -107.1-dB THD+N, which is maintained to within 3 dB even as the LC filter cutoff frequency is varied from 62 to 106 kHz. It can deliver a maximum of 21 W into a 4-Ω load with 87% efficiency and 12 W into an 8-Ω load with 91% efficiency, measured at 10% THD. Subject Audio power amplifierclass-D amplifierfeedback after LC filternonlinearity compensationtotal harmonic distortion (THD) To reference this document use: http://resolver.tudelft.nl/uuid:c614d55d-aac9-4242-88f1-2c7f249c31af DOI https://doi.org/10.1109/JSSC.2021.3125526 Embargo date 2022-10-04 ISSN 0018-9200 Source IEEE Journal of Solid State Circuits, 57 (4), 1153-1161 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. Part of collection Institutional Repository Document type journal article Rights © 2022 H. Zhang, Marco Berkhout, K.A.A. Makinwa, Q. Fan Files PDF A_121.5_dB_THD_Class_D_Au ... ession.pdf 2.93 MB Close viewer /islandora/object/uuid:c614d55d-aac9-4242-88f1-2c7f249c31af/datastream/OBJ/view