A highly efficient, 420mW class-H headphone amplifier with single power supply rail

Zhang, Xiang; Siek, Liter

doi:10.1109/edssc.2015.7285140

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Cited by 2 publications

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“…When both positive and negative supply rails are available, they both stay fixed at low absolute voltages for small output level; and one of them tracks the output with an offset, when the output level exceeds certain thresholds [18], [19]. The same approach can be implemented in a fully-differential bridge configuration with a single supply rail [20]- [22], where a bootstrapping amplifier topology has been proposed to further improve efficiency and linearity [23].…”

Section: Introductionmentioning

confidence: 99%

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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