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

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

doi:10.1109/isscc42614.2022.9731736

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“…This article, an extension of [9], presents a fully integrated Class-D piezoelectric speaker driver that achieves resistor-less damping by employing both voltage and CFB. With the help of a single external inductor, it can drive a 4 μF load capacitance with a peak current of 4.4 A while dissipating low idle power (122 mW) and achieving a peak high THD+N of −91.1 dB across a wide range of output amplitudes (10.2V rms ).…”

Section: Introductionmentioning

confidence: 99%

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

Karmakar

Berkhout²,

Makinwa

et al. 2022

IEEE J. Solid-State Circuits

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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 µF 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.

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Section: Introductionmentioning

confidence: 99%