应用于数字音频的二阶Sigma-Delta调制器设计  

Design of Second-Order Sigma-Delta Modulator for Digital Audio

作　　者：李亮[1] 陈珍海[2] 

机构地区：[1]苏州市职业大学电子信息工程系,江苏苏州215104 [2]中国电子科技集团公司58所,江苏无锡214035

出　　处：《微电子学与计算机》2010年第7期198-201,共4页Microelectronics & Computer

摘　　要：设计了一个应用于数字音频处理芯片的Sigma-Delta调制器,为了提高模数转换器的解析度,采用稳定的二阶结构,通过提高过采样率来实现.采用HJTC0.18μm CMOS工艺,在1.8V电压下设计过采样率为256的二阶开关电容调制器,使用Hspice和MATLAB对电路进行了仿真分析,结果表明可以达到92.5dB的信噪比,有效位数约16位.A second-order sigma-delta modulator for digital audio operational chip is designed in this paper. The modulator is proposed to increase the oversampling rate with a stable second-order structure in order to improve the ADC resolution. The schematic simulation and analysis is by the tools of Hspice and MATLAB with HJTC 0.18μm CMOS technology. The second-order switched-capacitor modulator with oversampling rate of 256 is designed at the 1.8V power supply. Finally, it is shown circuit simulation results of the sigma-delta modulator whose signal-noise rate is 92.5dB and resolution is 16bits.

关 键 词：SIGMA-DELTA调制器 全差分运算放大器 开关电容 比较器 

分 类 号：TN431[电子电信—微电子学与固体电子学]