Abstract

A switching scheme to realize 2nd-order digital-to-analog converter (DAC) mismatch error shaping (MES) technique in the high-resolution noise shaping successive approximation register analogue-to-digital converters (NS SAR ADCs) is proposed. By feeding back the combination of the least significant bit (LSB) DAC mismatch errors in two previous cycles, the DAC mismatch error is 2nd-order shaped. The scheme only requires an extra reference voltage and triples LSB DAC, which leads to simple control logic. According to the simulation, the spurious-free dynamic range is improved 10 dB more than the 1st-order MES.

中文翻译：

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噪声整形SAR ADC中DAC不匹配误差的二阶整形技术

摘要

提出了一种在高分辨率噪声整形逐次逼近寄存器模数转换器（NS SAR ADC）中实现二阶数模转换器（DAC）失配误差整形（MES）技术的切换方案。通过反馈前两个周期中最低有效位（LSB）DAC不匹配误差的组合，DAC不匹配误差为2阶整形。该方案仅需要一个额外的基准电压和三倍的LSB DAC，从而简化了控制逻辑。根据仿真，无杂散动态范围比一阶MES提高了10 dB。