【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．更多还原

【Abstract】 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.更多还原