A low quiescent current, low THD+N Class-D audio amplifier with area-efficient PWM-residual-aliasing reduction

Shih Hsiung Chien, Yi Wen Chen, Tai Haur Kuo

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

An area-efficient pulsewidth modulation (PWM)-residual-aliasing reduction technique is proposed for Class-D audio amplifiers by utilizing a low-complexity feed-forward path to cancel the PWM high-frequency components inside the feedback loop. The proposed technique reduces the PWM-residual-aliasing distortion without increasing the required switching frequency or power-hungry controller circuits, thereby lowering both the quiescent current and total harmonic distortion plus noise (THD+N) in Class-D audio amplifiers. Measurement results show that the proposed technique improves the THD+N of second-order Class-D amplifiers by 16.2 dB with a 1-kHz input; in addition, the Class-D amplifier of this paper achieves a minimum THD+N of 0.0032% while operating at a 215-kHz switching frequency, resulting in a reduction in quiescent current of more than 33%. Compared with other state of the arts, this paper implemented in 0.5-μm CMOS technology features a competitive THD+N while consuming the lowest quiescent current of 0.96 mA and occupying the smallest active area of 0.49 mm2.

Original languageEnglish
Article number8510816
Pages (from-to)3377-3385
Number of pages9
JournalIEEE Journal of Solid-State Circuits
Volume53
Issue number12
DOIs
Publication statusPublished - 2018 Dec

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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