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An 8 25 W 1-THD 104 dBA-Dynamic-Range Class-D Audio Ampli fier With Ultra-Low EMI
一款用于便携设备的2.5W 1% THD Class-D音频放大器，具有104 dB(A)动态范围和超低EMI。
2.5W 1% THD, 104 dB(A)动态范围
Class-D放大器便携设备超低EMI动态范围扬声器保护
▸新型功率级架构以减少硅面积
▸超低EMI系统(ULEMI)减少高频能量
▸嵌入式负载电流感应用于扬声器保护算法
Abstract
Class-D ampli fiers for portable devices are now de-
manding more than 2 W 1% THD output power on 8 speakers
in smartphone and tablet for a be tter multi-media user experi-
ence. However higher acoustic power brings a lot of additional
constraints such as speaker damage, more EMI energy and bat-
tery reset. The presented paper demonstrates a 2.5 W 1% THD
into 8
Class-D ampli fier with 104 dB(A) dynamic range using a
new power stage architecture to reduce silicon area. The design in-
cludes a ULEMI