A 4Ω 2.3W class-D audio amplifier with embedded DC-DC boost converter, current-sensing ADC and DSP for adaptive speaker protection

Author

Berkhout, M. ; Dooper, L. ; Krabbenborg, B. ; Somberg, J.

Author_Institution

NXP Semicond., Nijmegen, Netherlands

fYear

2013

Firstpage

180

Lastpage

181

Abstract

The trend in portable devices such as smart phones and tablets is towards higher audio output power. This can be achieved by lowering the speaker impedance or increasing the voltage swing at the amplifier output by boosting the supply voltage [1-4]. Typical speakers in portable devices are quite fragile and can be damaged easily when the voice coil temperature or membrane excursion exceeds the rated limits. This work presents a smart speaker driver system that maximizes acoustic output while ensuring the speaker is not damaged.

Keywords

DC-DC power convertors; analogue-digital conversion; audio-frequency amplifiers; digital signal processing chips; DSP; adaptive speaker protection; class-D audio amplifier; current-sensing ADC; embedded DC-DC boost converter; membrane excursion; portable devices; power 2.3 W; resistance 4 ohm; smart phones; smart speaker driver system; speaker impedance; voice coil temperature; voltage swing; Current measurement; Impedance; Power amplifiers; Power generation; Resistors; Semiconductor device measurement; Temperature measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference Digest of Technical Papers (ISSCC), 2013 IEEE International

Conference_Location

San Francisco, CA

ISSN

0193-6530

Print_ISBN

978-1-4673-4515-6

Type

conf

DOI

10.1109/ISSCC.2013.6487690

Filename

6487690