本文设计实现了一个高精度的双通道过采样Ａ／Ｄ电路，它采用由两个二阶调制器级联实现的四阶增量－总和调制器结构，并通过优化调制器内部各级增益，在改善过采样Ａ／Ｄ的大信号过载特性的同时提高其最大输出信嗓比．为降低数字开关噪声对过采样Ａ／Ｄ性能的影响，本文采用了一种低噪声电流控制逻辑设计数字电路．实验芯片的测试结果表明，在６４倍的过采样率下，电流控制逻辑通道和静态ＣＭＯＳ逻辑通道分别获得了９１ｄＢ和８４．５ｄＢ的输出动态范围． In this paper, a high-precision dual-channel oversampling A / D circuit is designed and implemented. It uses a fourth-order delta-sigma modulator structure cascaded by two second-order modulators. By optimizing the internal gain of the modulator, In improving the oversampling A / D large signal overload characteristics while increasing the maximum output signal to voice ratio. To reduce the impact of digital switching noise on oversampling A / D performance, a low noise current control logic is used to design a digital circuit. Experimental chip test results show that the current control logic channels and static CMOS logic channels achieve 91dB and 84.5dB output dynamic range respectively at an oversampling rate of 64x.