Print Email Facebook Twitter A 121.4dB DR, -109.8dB THD+N Capacitively-Coupled Chopper Class-D Audio Amplifier Title A 121.4dB DR, -109.8dB THD+N Capacitively-Coupled Chopper Class-D Audio Amplifier Author Zhang, H. (TU Delft Electronic Instrumentation) Berkhout, Marco (Goodix Technology) Makinwa, K.A.A. (TU Delft Microelectronics) Fan, Q. (TU Delft Electronic Instrumentation) Contributor Fujino, Laura C. (editor) Department Microelectronics Date 2022 Abstract Class-D amplifiers (CDAs) are often used in audio applications due to their superior power efficiency. Due to the sensitivity of the human ear, a large dynamic range (DR) is desired, and audio DACs with up to 130dB DR are commercially available [1]. However, the DR of the CDAs they drive is typically much lower [2]-[4], mainly due to the thermal noise introduced by the input resistors of their resistive feedback networks. Reducing this resistance is difficult, as it reduces the CDA's input impedance and increases the required loop-filter capacitance. Alternatively, the CDA could be configured as a capacitively coupled chopper amplifier (CCCA), whose capacitive feedback network could then achieve low noise without reducing input impedance. However, the large PWM component present at its output would then saturate its input stage. By exploiting the inherent PWM filtering present in a feedback-after-LC architecture, this paper presents a capacitively coupled chopper CDA, resulting in significantly improved DR and THD+N. The prototype achieves 8V_RMS of integrated output noise (A-weighted), a 121.4dB DR, and -1 09.8dB THD+N while delivering a maximum of 15/26W into an 8/4Omega load with 93%/88% efficiency. To reference this document use: http://resolver.tudelft.nl/uuid:9836394b-5257-4e3d-9d46-4d66c5a14489 DOI https://doi.org/10.1109/ISSCC42614.2022.9731737 Publisher IEEE, Danvers Embargo date 2022-09-17 ISBN 978-1-6654-2801-9 Source 2022 IEEE International Solid- State Circuits Conference (ISSCC): Digest of technical papers Event 2022 IEEE International Solid- State Circuits Conference (ISSCC), 2022-02-20 → 2022-02-26, Online at San Francisco, United States Series Digest of Technical Papers - IEEE International Solid-State Circuits Conference, 0193-6530, 2022-February 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 conference paper Rights © 2022 H. Zhang, Marco Berkhout, K.A.A. Makinwa, Q. Fan Files PDF A_121.4dB_DR_109.8dB_THDN ... ier_1_.pdf 951.09 KB Close viewer /islandora/object/uuid:9836394b-5257-4e3d-9d46-4d66c5a14489/datastream/OBJ/view