摘要
D类音频功率放大器设计系统中,前置运算放大器大多采用全差分设计,为实现较好的THD性能及噪声特性,要求其具有较宽的输入输出电压范围,高SNR,高PSRR,高CMRR。本文运用标准的电路理论和噪声模型,详细分析了运算放大器电路的噪声及应用在D类功放中引起的整体噪声特性,并给出改善放大器噪声性能的设计方法及设计结果。
The fully differential amplifier is usually used as a preamplifier in class D audio power amplifier system in which wide input＆output voltage range and high SNR＆PSRR＆CMRR is needed to achieve nice THD and noise performance.The noise of the amplifier and the preamplifier in class D audio amplifier is analysed in detail with standard circuit theory and niose models in this paper, and the design method to improve noise characteristic and the design result is,presented.
出处
《中国集成电路》
2008年第5期56-60,共5页
China lntegrated Circuit
