An 80.4% Peak Power Efficiency Adaptive Supply Class H Power Amplifier for Audio Applications

Zhang, Xiang; Siek, Liter

doi:10.1109/tvlsi.2017.2666268

Cited by 6 publications

(1 citation statement)

References 23 publications

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“…of using two amplifiers per speaker is employed to increase the available power for the speaker. Zhang et al introduce a class H power amplifier designed for audio applications on batterypowered electronic devices [105]. Class H amplifier is a type of amplifiers that uses two different power supply voltages.…”

Section: Micro-speaker Electrical Circuitrymentioning

confidence: 99%

MEMS audio speakers ^*

Garud,

Pratap

2023

J. Micromech. Microeng.

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Miniaturization of electro-mechanical sensors and actuators has benefited from an advancement in CMOS technology over the years. However, miniaturization of audio speakers has seen considerable development only in the recent times. This paper reviews the developments in MEMS audio speaker research and the initial commercial products available in the market. At first glance, it appears that the relatively slow development of MEMS speakers can be attributed to the fact that the principle of actuation has remained unchanged for several decades. Unfortunately, the physics behind audible sound production holds us back from exclusively adopting miniaturized speakers — sound pressure level is directly proportional to the area of the sound radiating surface. Nevertheless, researchers are continuing to explore new avenues for designing and developing MEMS speakers, without limiting themselves to the existing actuation principles. With newly discovered materials and improving technology, the research in MEMS speakers is gaining attention and new products are emerging. A speaker design based on piezoelectric actuation or electrostatics actuation is favourable at MEMS scale. Indian research community is also contributing to advances in MEMS speakers and near-ultrasonic devices. This paper reviews the development in MEMS audio speakers in India and in the world. The tabulated review findings aim to offer readers an overview of the development of micro-speakers and to provide guidance for designing new micro-speakers.

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Section: Micro-speaker Electrical Circuitrymentioning

confidence: 99%

MEMS audio speakers ^*

Garud,

Pratap

2023

J. Micromech. Microeng.

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An 87% Peak Efficiency, 37W, Class H Audio Amplifier with GaN Output Stage

Utomo

Siek

Yap

et al. 2018

2018 IEEE Nordic Circuits and Systems Conference (NORCAS): NORCHIP and International Symposium of System-on-Chip (SoC)

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Class–CTA: Concept and Theoretical Analysis of a High Linearity and Efficiency Power Stage Architecture

Baxevanakis,

Nikitas,

Sotiriadis

2023

IEEE Open J. Circuits Syst.

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This work presents a power stage architecture that combines high-linearity with highefficiency. The power stage is configured as a push-pull Class-A topology with two buck-converters providing its supply rails. The buck-converters continuously track the stage's output with a small constant margin, creating a minimum, constant voltage drop on the output devices; thus, the stage's efficiency is increased and its linearity is improved. Theoretical analysis of the topology and its feedback control are presented, while a design example is implemented and simulated in Cadence Spectre as proof-of-concept.

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An 80.4% Peak Power Efficiency Adaptive Supply Class H Power Amplifier for Audio Applications

Cited by 6 publications

References 23 publications

MEMS audio speakers ^*

MEMS audio speakers ^*

An 87% Peak Efficiency, 37W, Class H Audio Amplifier with GaN Output Stage

Class–CTA: Concept and Theoretical Analysis of a High Linearity and Efficiency Power Stage Architecture

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An 80.4% Peak Power Efficiency Adaptive Supply Class H Power Amplifier for Audio Applications

Cited by 6 publications

References 23 publications

MEMS audio speakers *

MEMS audio speakers *

An 87% Peak Efficiency, 37W, Class H Audio Amplifier with GaN Output Stage

Class–CTA: Concept and Theoretical Analysis of a High Linearity and Efficiency Power Stage Architecture

Contact Info

Product

Resources

About

MEMS audio speakers ^*

MEMS audio speakers ^*