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A 60 mW Class-G Stereo Headphone Driver for Portable Battery-Powered Devices Sherif Galal, Hui Zheng, Khaled Abdelfattah, Vina y Chandrasekhar, Iuri Mehr, Alex Jianzhong Chen, John Platenak, Nir Matalon, and Todd L. Brooks
一款用于便携设备的60mW Class-G立体声耳机驱动器，具有高效率和抗干扰能力。
111 dB动态范围，120 dB PSRR，2.3 mm²面积
Class-G耳机驱动器便携设备高效率抗干扰
▸采用高阶前馈环路拓扑提高抗电池干扰能力
▸Class-G放大器与Class-AB/B驱动级结合提升小信号效率
▸优化设计延长音乐播放时间
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 var- ious design challenges for audio ampli fiers in a wireless environ- ment. A high-order feed-forward loop topology provides high im- munity to battery disturbance with extended correction range. In addition, a Class-G ampli fier with a Class-AB/B driving stage im- proves the small-signal efficiency and extends music playback time. I m p l e m e n t e di n0 . 1 8 m 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 mm .