A 0.6-V 38-nW 9.4-ENOB 20-kS/s SAR ADC in 0.18-<formula formulatype="inline"><tex Notation="TeX">$\mu{\rm m}$</tex> </formula> CMOS for Medical Implant Devices

This paper presents a 10-bit ultra-low power successive approximation register (SAR) analog-to-digital converter (ADC) for implantable medical devices. To achieve the nanowatt range power consumption, a novel switching scheme is proposed, which can accomplish the first three comparisons without consuming any energy and thus improve the energy efficiency significantly. In addition, to boost the offset performance of the comparator working under...