Title :
A 60 mW Class-G Stereo Headphone Driver for Portable Battery-Powered Devices
Author :
Galal, Sherif ; Zheng, Hui ; Abdelfattah, Khaled ; Chandrasekhar, Vinay ; Mehr, Iuri ; Chen, Alex Jianzhong ; Platenak, John ; Matalon, Nir ; Brooks, Todd L.
Author_Institution :
Broadcom Irvine, Irvine, CA, USA
Abstract :
A 60 mW 1.15 mA/channel Class-G stereo headphone driver primarily designed for demanding applications in mobile phones and other portable communication devices is described. The architecture of the driver has been chosen to overcome the various design challenges for audio amplifiers in a wireless environment. A high-order feed-forward loop topology provides high immunity to battery disturbance with extended correction range. In addition, a Class-G amplifier with a Class-AB/B driving stage improves the small-signal efficiency and extends music playback time. Implemented in 0.18 μm CMOS technology, the stereo headphone driver achieves a DR of 111 dB and PSRR of 120 dB at the GSM TDMA frequency of 217 Hz while occupying an area of 2.3 mm2.
Keywords :
CMOS integrated circuits; audio-frequency amplifiers; driver circuits; feedforward amplifiers; headphones; mobile handsets; CMOS technology; GSM TDMA; audio amplifiers; battery disturbance; class-AB-B driving stage; class-G stereo headphone driver; current 1.15 mA; frequency 217 Hz; high-order feedforward loop topology; mobile phones; portable battery-powered devices; portable communication devices; power 60 mW; size 0.18 mum; small-signal efficiency; wireless environment; Bandwidth; Batteries; Gain; Headphones; Noise; Power supplies; Topology; Audio amplifiers; charge pump; class-AB amplifier; class-G amplifier; efficiency; frequency compensation; power-supply rejection; quiescent current;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2012.2197155
