A THD-reduction high-efficiency audio amplifier using inverter-based OTAs with filter-output feedback

This paper presents an integrated low-voltage THD-reduction high-efficiency class-D audio amplifier using inverter-based operational transconductance amplifiers (OTAs). We propose a negative feedback loop which can compensate for external perturbations and improving output precision. The compensator...

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Bibliographic Details
Published inMicroelectronics Vol. 45; no. 1; pp. 102 - 109
Main Authors Hwang, Yuh-Shyan, Shen, Jian-Hong, Chen, Jiann-Jong, Fan, Ming-Ren
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.01.2014
Subjects
Amplification
Amplifiers
Class-D amplifier
Comparators
Dissipation
Electric potential
Feedback
Inverter
Low voltage
Maximum power
Pulse-width modulation
Rejection
Inverter
Low voltage
Class-D amplifier
Pulse-width modulation
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Summary:This paper presents an integrated low-voltage THD-reduction high-efficiency class-D audio amplifier using inverter-based operational transconductance amplifiers (OTAs). We propose a negative feedback loop which can compensate for external perturbations and improving output precision. The compensator increases the audio-frequency loop gain, and leads to a better rejection of audio-frequency disturbances. The use of inverter-based OTA and comparator provides low-voltage operation and low-power dissipation. The audio amplifier operates with a 1.5V supply voltage with maximum power efficiency of 90%. The proposed class-D amplifier was implemented using a TSMC 0.18-μm 1P6M CMOS process, and the active chip area is 1.87mm2.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1879-2391
0026-2692
1879-2391
DOI:10.1016/j.mejo.2013.10.007