18位过采样∑△A／D变换器设计  

Design of Oversampling 18-Bit ∑△A/D Converter

作　　者：洪志良[1] 曹先国[1] 王晓悦[1] 

机构地区：[1]复旦大学电子工程系

出　　处：《Journal of Semiconductors》1996年第11期830-838,共9页半导体学报（英文版）

基　　金：国家自然科学基金;王宽成访德基金;德国SIBET公司资助

摘　　要：本文介绍１８位精度音频（带宽２０ｋＨｚ）过采样∑△Ａ／Ｄ变换器．文中根据精度、阶数和过采样比关系，设计了４阶２－２结构∑△面调制器，在设计梳状抽频滤波器和波数字滤波器时分别应用了模数定理和硬件复用技术．在１．２μｍＣＭＯＳ工艺设计完成后，电路的结构和精度通过ＥＬＤＯ模拟器和Ｃ模拟器得到了验证．Abstract This paper will present an oversampling 18-bit A/D converter. According to the relationship among resolution, order and oversampling ratio, a fourth-order ∑△ A/D modulator has been designed. The wordlength law and hardware reusing technique have been applied in designing decimator and wave digital filter. The function and performance of the circuit in 1. 2μm CMOS technology have been verified with ELDO mixed simulator and C simulator, and key unit OTA has been processed and tested.

关 键 词：∑△A/D变换器 过采样 设计 

分 类 号：TP335.1[自动化与计算机技术—计算机系统结构]