A 14-bit 10kS/s power efficient 65nm SAR ADC for cardiac implantable medical devices

Abstract

This brief presents a 10kS/s 14 bit 12.5 ENOB Successive Approximation Register Analog-to-Digital Converter for Cardiac Implantable Medical. For achieving power efficient operation, SAR ADC employ SAR control, a new power and noise efficient comparator topology, non-binary weighted capacitive DAC. The linearity of implemented SAR ADC is enhanced with the uniform geometry of non-binary weighted capacitive DAC.The proposed SAR ADC is implemented using 65nm CMOS technology. The latched comparator consumes a power of 2.4uW and it provides an ENOB of 12.6 at a supply voltage of 1V.The INL is between -2.7/+1.6 LSB and DNL is between -0.6/+1.4LSB. The FOM of ADC is 40fJ/conv.Step which is comparable with existing ADC topologies.