A novel switching method is proposed and implemented in a 10-bit fully differential SAR ADC. When compared with the charge recycling or the set-and-down approach, the proposed scheme uses a single-ended switching procedure to reduce the total switching energy by 80% or 20%, respectively. Besides, two redundant decisions are inserted in the SAR ADC with a 4b/4b/4b configuration, which is capable of more than 30% speed enhancement. The 10-bit SAR ADC’s performance is verified through Matlab simulation and it achieves 10-b resolution. After a Monte-Carlo analysis (100- times), the mean value of the SNDR is 61.8dB, and the maximum INL and DNL are 0.05LSB and 0.1LSB, respectively.