应用于中高速SAR ADC的低功耗少开关开关方法

提出一种应用于中高速逐次逼近型模数转换器（successive approximation register analog-to-digital converter，SAR ADC）的低功耗开关方法，该开关方法不需要额外的基准产生电路，并且需要的开关数量最少。使用重置序列（0 1…1）而不是（1 1…1）可以使得第2个位转换周期消耗的开关能量为0。为了进一步降低功耗，参考电容C使用C/2（两个C串联）并联来实现，这样所需要的C的数量又减少了将近一半，开关功耗又减少了一半。在同样的开关数量下，提出的开关方法消耗开关能量和需要的电容面积最小

Low-power consumption switching scheme with reduced switches for medium-or high-speed SAR ADCs

A low-power switching scheme for medium-or high-speed successive approximation register analog-to-digital converter（SAR ADCs）was proposed, which requires the fewest switches but does not need extra reference generation circuit. By resetting series (0 1…1) rather than (1 1…1), no switching energy was consumed during the second bit cycle. To further reduce the switching energy, C was realized by two C/2 in parallel where C/2 is two Cs in series. The required number of C and the switching energy were nearly reduced by half. The results indicate that the proposed switching method is the most energy-efficient and area-efficient with the fewest switches.