Title
A − 91 dB THD + N, Class-D Piezoelectric Speaker Driver Using Dual Voltage/Current Feedback for Resistor-Less LC Resonance Damping
Author
Karmakar, S. (TU Delft Electronic Instrumentation) 
Berkhout, Marco (Goodix Technologies)
Makinwa, K.A.A. (TU Delft Microelectronics)
Fan, Q. (TU Delft Microelectronics)
Department
Microelectronics
Date
2022
Abstract
This article presents a Class-D audio amplifier for capacitive piezoelectric speaker loads. Employing a dual voltage feedback (VFB)/current feedback (CFB) topology, the amplifier is capable of damping LC resonance without using an external damping resistor, therefore reducing system power consumption, cost, and size. Additional power savings are achieved by using a push–pull (PP)-modulated output stage. To mitigate linearity degradation due to the mismatch of the feedback resistors, they are dynamically matched by employing choppers. The prototype, taped out in a BCD 180-nm process, can drive up to 4 μ F load with a peak current of 4.4 A while achieving an idle power consumption of 122 mW and a peak THD + N of − 91 dB.
Subject
Audio power amplifier
chopping
class-D amplifier
current feedback (CFB)
piezoelectric speakers
push–pull (PP) modulation
resistor-less LC damping
To reference this document use:
http://resolver.tudelft.nl/uuid:82181619-2956-4528-8bc6-30d6595167fd
DOI
https://doi.org/10.1109/JSSC.2022.3207386
Embargo date
2023-06-15
ISSN
0018-9200
Source
IEEE Journal of Solid State Circuits, 57 (12), 3726-3735
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 S. Karmakar, Marco Berkhout, K.A.A. Makinwa, Q. Fan