Title :
An 8Ω 2.5W 1%-THD 104dB(A)-dynamic-range Class-D audio amplifier with an ultra-low EMI system and current sensing for speaker protection
Author :
Nagari, Angelo ; Allier, Emmanuel ; Amiard, Francois ; Binet, Vincent ; Fraisse, Christian
Author_Institution :
ST-Ericsson, Grenoble, France
Abstract :
Class-D amplifiers for portable devices are typically specified for supply voltage range ideal for use with lithium batteries [1-4]. The high efficiency of Class-D amplifiers makes them ideal for operation from boosted supplies. Moreover, in order to provide a better user experience in all multi-media applications, the new smart-phones and tablets are demanding for output peak power of higher than 2W on 8Ω integrated speakers. In addition, new speakers can achieve better linearity and sensitivity leading to lower THD and noise specification for the amplifier.
Keywords :
audio-frequency amplifiers; electromagnetic interference; current sensing; dynamic-range class-D audio amplifier; lithium batteries; multimedia application; portable devices; smart-phones; speaker protection; supply voltage range; tablets; ultra-low EMI system; Batteries; Electromagnetic interference; Frequency modulation; Jitter; Noise; Sensors;
Conference_Titel :
Solid-State Circuits Conference Digest of Technical Papers (ISSCC), 2012 IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
978-1-4673-0376-7
DOI :
10.1109/ISSCC.2012.6176883
