A Vaq-based switching scheme with capacitor-splitting structure is proposed for successive approximation register analog-to-digital converter. Different from common tri-level schemes utilizing Vcm (1/2Vref), a new third reference voltage Vaq (1/4Vref) is applied to the proposed scheme. Benefiting from Vaq, the proposed scheme achieves 87.5% capacitor area reduction over the conventional scheme. Due to capacitor-splitting structure, there is no switching energy consumption in the first three comparison cycles. And 99.82% switching energy saving is realized in the proposed scheme. Behavioral simulation shows that the maximum DNL and INL of the proposed scheme are both 0.310 LSB. Compared with the prior switching schemes, the proposed scheme achieves a good balance among energy saving, area efficiency and linearity.

针对逐次逼近寄存器模数转换器，提出了一种基于Vaq的具有电容分裂结构的开关方案。与利用Vcm（1 / 2Vref）的常见三电平方案不同，将新的第三参考电压Vaq（1 / 4Vref）应用于建议的方案。受益于Vaq，与传统方案相比，该方案可将电容器面积减少87.5％。由于采用了电容器分离结构，在前三个比较周期中没有开关能量消耗。该方案实现了99.82％的开关节能。行为仿真表明，该方案的最大DNL和INL均为0.310 LSB。与现有的开关方案相比，该方案在节能，面积效率和线性度之间达到了良好的平衡。