应用于音频芯片的高精度ΣΔ调制器设计  

Design of High Resolution ΣΔ Modulator for Audio Chip

作　　者：沈琪[1] 王伟印[1] 顾晓峰[1] 朱晓勇 

机构地区：[1]轻工过程先进控制教育部重点实验室,江南大学电子工程系,江苏无锡214122 [2]无锡友芯集成电路设计有限公司,江苏无锡214000

出　　处：《固体电子学研究与进展》2012年第6期604-609,共6页Research & Progress of SSE

基　　金：国家自然科学基金资助项目(11074280);中央高校基本科研业务费专项资金资助项目(JUDCF12027,JUDCF12032);江苏省普通高校研究生创新计划资助项目(CXLX11-0486)

摘　　要：低阶单比特量化ΣΔ调制器简单稳定且特别适用于音频领域的模数转换器。提出了一款应用于音频芯片的二阶单比特量化ΣΔ调制器,利用Simulink对调制器进行建模并确定调制器参数与电路子模块指标。该调制器电路采用CSMC0.35μmCMOS工艺实现,工作的电源电压为5V,采用全差分开关电容技术,功耗为12mW,核心面积为390μm×190μm。在采样频率为12MHz、输入信号频率为20kHz时,调制器精度达到16bit,测试结果验证了设计技术和建模方法。Low order ∑△ modul and stable analog-digital converters ator with single which is particul er ∑△ modulator employing single bit quantization y Simulink to determine the parameters of the mod bit quantizer provides a way to realize simple arly suitable for the audio field. A second-or- used in audio chips is proposed and modeled ulator and the detailed indices of sub-module circuits. The modulator is implemented by CSMC 0. 35 ffm CMOS process and operated with a supply voltage of 5 V by using the fully-differential switched-capacitor technique. The power consumption is 12 mW, and the area of core circuit is 390 umX 190 tLm. Operating at a sampling rate of 12 MHz with an input signal frequency of 20 kHz, the modulator achieves a resolution 16 bits. The design methodology is verified by testing results.

关 键 词：∑△调制器 开关电容 过采样 高精度 音频 

分 类 号：TN761[电子电信—电路与系统]