A moving binary search SAR-ADC for low power biomedical data acquisition system

A moving binary search tree based successive approximation register analog-to-digital converter (SAR-ADC) dedicated for low power biomedical data acquisition system is presented. By performing the conversion based on the previous results, the required ADC conversion cycles is reduced significantly leading to great saving in power consumption. Simulation results based on typical electrocardiograph (ECG) signals show that the proposed SAR-ADC saves 52.6% of conversion cycles for a 10-bit SAR-ADC, corresponding to a power saving of about 45% as compared to its conventional counterparts, while maintaining the same resolution and accuracy.