In this paper, a low-energy switching scheme based on the asymmetric binary search algorithm for successive approximation register (SAR) analog-to-digital converters (ADCs) is proposed. To reduce switching energy and area, the proposed scheme uses the single-side switching method and the least significant bit (LSB) capacitor is split into two one-half unit capacitors. Using the series capacitance scheme, the capacitance mismatch caused by process deviation is effectively improved. Compared with the conventional switching method, the switching energy of this scheme is decreased by 99.43% and the area is saved by 87.2%. MATLAB simulation results show that this scheme also has a low nonlinearity that the maximum differential nonlinearity is only 0.37 LSB and the maximum integral nonlinearity is only 0.43 LSB.

中文翻译：

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一种用于 SAR ADC 的具有非对称二进制搜索算法的 99.43% 节能开关方案

在本文中，针对逐次逼近寄存器 (SAR) 模数转换器 (ADC) 提出了一种基于非对称二进制搜索算法的低能量切换方案。为了减少开关能量和面积，所提出的方案使用单侧开关方法，并将最低有效位 (LSB) 电容器拆分为两个二分之一的单元电容器。采用串联电容方案，有效改善工艺偏差造成的电容失配。与传统开关方式相比，该方案开关能量降低99.43%，面积节省87.2%。MATLAB仿真结果表明，该方案还具有较低的非线性，最大微分非线性仅为0.37 LSB，最大积分非线性仅为0.43 LSB。