A 10b 100kS/s SAR ADC with charge recycling switching method

Abstract

This paper presents a low-voltage and energy-efficient 10b SAR ADC which manipulates charge recycling switching method for saving the switching energy. In additional, a window-based reconfigurable comparator is used to achieve fast comparison and small power dissipation. The proposed 10b SAR ADC operates at 100kS/s with 0.4V supply voltage in 90nm CMOS. The measurement results show that the prototype ADC achieve 55.37dB SNDR at Nyquist rate with only 107nW. The Figure-of-Merit (FoM) is 2.23fJ/conv.-step.