Print Email Facebook Twitter A Chopper Class-D Amplifier for PSRR Improvement Over the Entire Audio Band Title A Chopper Class-D Amplifier for PSRR Improvement Over the Entire Audio Band Author Zhang, H. (TU Delft Electronic Instrumentation) Rozsa, N.N.M. (TU Delft Electronic Instrumentation) Berkhout, Marco (Goodix Technologies) Fan, Q. (TU Delft Electronic Instrumentation) Date 2022 Abstract The power supply rejection ratio (PSRR) of conventional differential closed-loop Class-D amplifiers is limited by the feedback and input resistor mismatch and finite common-mode rejection ratio (CMRR) of the operational transconductance amplifier (OTA) in the first integrator. This article presents a 14.4-V Class-D amplifier employing chopping to tackle the mismatch, thereby improving the PSRR. However, chopping-induced intermodulation (IM) within a pulsewidth modulation (PWM)-based Class-D amplifier can severely degrade PSRR and linearity. Techniques to mitigate such IM are proposed and analyzed. To chop the 14.4-V PWM output signal, a high-voltage (HV) chopper employing double-diffused MOS (DMOS) transistors is developed. Its timing is carefully aligned with that of the low-voltage (LV) choppers to avoid further linearity degradation. The prototype, fabricated in a 180-nm BCD process, achieves a PSRR of >110 dB at low frequencies, which remains above 79 dB up to 20 kHz. It achieves a total harmonic distortion (THD) of -109.1 dB and can deliver a maximum of 14 W into an 8- \Omega load with 93% efficiency while occupying a silicon area of 5 mm2. Subject Audio power amplifierClass-D amplifierintermodulation (IM)power supply rejection ratio (PSRR)total harmonic distortion (THD). To reference this document use: http://resolver.tudelft.nl/uuid:743f3859-5920-4a19-a2c1-1d7f45599c37 DOI https://doi.org/10.1109/JSSC.2022.3161136 Embargo date 2023-07-01 ISSN 0018-9200 Source IEEE Journal of Solid State Circuits, 57 (7), 2035 - 2044 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, N.N.M. Rozsa, Marco Berkhout, Q. Fan Files PDF A_Chopper_Class_D_Amplifi ... o_Band.pdf 3 MB Close viewer /islandora/object/uuid:743f3859-5920-4a19-a2c1-1d7f45599c37/datastream/OBJ/view