一种高效率数字音频功放芯片的设计与实现  

Design and Implementation of an Efficient Digital Audio Amplifier IC

作　　者：蒋正萍[1] 巫丛平[1] 李寿强[1] 

机构地区：[1]成都电子机械高等专科学校,成都610031

出　　处：《微电子学》2011年第4期536-539,544,共5页Microelectronics

摘　　要：提出了一种集合时分复用高阶数字滤波器、4阶Σ-Δ调制器,以及全对称差分调制输出的数字音频功放芯片,重点阐述了以上电路模块的实现。经测试验证,该芯片的信噪比(SNR)达到100 dB,总谐波失真加噪声(THD+N)最小达到0.07%,无闲置功耗和死区效应,实现了瓦级功率输出。A digital audio power amplifier IC was presented,which was comprised of higher-order digital filter for time division multiplexer（TDM）,fourth-order Σ-Δ modulator and fully-symmetric differential modulator circuit.Implementation of these circuit blocks were described in particular.Test results showed that the digital audio amplifier IC had an SNR of 100 dB and a THD＋N down to 0.07%.Without idle power and dead-zone effect,the circuit had an output power of Watt level.

关 键 词：数字音频功放 Σ-Δ调制器 数字滤波器 

分 类 号：TN492[电子电信—微电子学与固体电子学]