A tracking and pre-sampling technique for SAR ADC

This study provides a tracking and pre-sampling (TPS) technique which drives successive approximation register (SAR) analog-to-digital converters (ADC) with small input current. And the principle of TPS technique is demonstrated by means of complex frequency domain analysis. In contrast with two traditional SAR ADCs, the simulation results of matlab and cadence indicate the SAR ADC with TPS technique reduces both transient and average input current significantly, whether under DC or cosine wave input voltages.