DocumentCode :
1341676
Title :
An 8 
2.5 W 1%-THD 104 dB(A)-Dynamic-Range Class-D Audio Amplifier With Ultra-Low EMI System and Current Sensing for Speaker Protection
Author :
Nagari, Angelo ; Allier, Emmanuel ; Amiard, François ; Binet, Vincent ; Fraisse, Christian
Author_Institution :
ST-Ericsson, Grenoble, France
Volume :
47
Issue :
12
fYear :
2012
Firstpage :
3068
Lastpage :
3080
Abstract :
Class-D amplifiers for portable devices are now demanding more than 2 W 1% THD output power on 8 Ω speakers in smartphone and tablet for a better multi-media user experience. However higher acoustic power brings a lot of additional constraints such as speaker damage, more EMI energy and battery reset. The presented paper demonstrates a 2.5 W 1% THD into 8 Ω Class-D amplifier with 104 dB(A) dynamic range using a new power stage architecture to reduce silicon area. The design includes a ULEMI system to reduce high frequency energy without impact on audio band noise and an embedded load current sensing for speaker protection algorithm.
Keywords :
acoustic intensity measurement; audio-frequency amplifiers; electromagnetic interference; multimedia communication; smart phones; EMI energy; THD output power; ULEMI system; acoustic power; audio band noise; battery reset; class-D audio amplifier; embedded load current sensing; high frequency energy reduction; multimedia user experience; portable device; power 2.5 W; power stage architecture; resistance 8 ohm; smartphone; speaker damage; speaker protection algorithm; tablet; ultra-low EMI system; Batteries; Capacitors; Gain control; Logic gates; MOS devices; Power generation; Sensors; EMC; EMI; Switching amplifier; audio amplifier; class-D; current sensing; pulse width modulation; speaker driver; speaker protection;
fLanguage :
English
Journal_Title :
Solid-State Circuits, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9200
Type :
jour
DOI :
10.1109/JSSC.2012.2225762
Filename :
6365768
Link To Document :
