Title
A -91 dB THD+N Resistor-Less Class-D Piezoelectric Speaker Driver Using a Dual Voltage/ Current Feedback for LC Resonance Damping
Author
Karmakar, S. (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
Piezoelectric speakers are gaining popularity on account of their improving form-factor and audio quality, making them a good fit for many audio applications such as in televisions, laptops, etc. Such speakers can be modelled as a large capacitive load, and so are typically driven by a Class-AB amplifier via a series resistor that ensures driver stability, and limits load current, but wastes power [1], [2]. In [3], the Class-AB amplifier is replaced by a more power-efficient Class-D amplifier (CDA) in series with an additional inductor. However, a series resistor is still required to damp the resulting LC resonant circuit, which could otherwise draw excessive currents when excited by large-signal distortion (e.g. clipping) harmonics around the LC resonance frequency. Alternatively, by using a feed-forward architecture based on LC filter diagnostics to limit overshoot currents, the series resistor can be replaced by a second inductor, at the expense of increased system complexity and cost [4].
To reference this document use:
http://resolver.tudelft.nl/uuid:7c364baa-380a-4df3-9ac9-801099b9f72d
DOI
https://doi.org/10.1109/ISSCC42614.2022.9731736
Publisher
IEEE, Danvers
Embargo date
2022-09-17
ISBN
978-1-6654-2801-9
Source
2022 IEEE International Solid-State Circuits Conference, ISSCC 2022: 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 S. Karmakar, Marco Berkhout, K.A.A. Makinwa, Q. Fan