A − 91 dB THD + N, Class-D Piezoelectric Speaker Driver Using Dual Voltage/Current Feedback for Resistor-Less LC Resonance Damping

Shoubhik Karmakar, Marco Berkhout, Kofi A.A. Makinwa, Qinwen Fan*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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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.
Original languageEnglish
Pages (from-to)3726-3735
Number of pages10
JournalIEEE Journal of Solid-State Circuits
Volume57
Issue number12
DOIs
Publication statusPublished - 2022

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.

Keywords

  • Audio power amplifier
  • chopping
  • class-D amplifier
  • current feedback (CFB)
  • piezoelectric speakers
  • push–pull (PP) modulation
  • resistor-less LC damping

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