8-bit 50ksps ULV SAR ADC

2015

With the growing market of MCUs and embedded electronic powered by batteries, more

energy efficient peripherals are needed. This project presents an Analog to Digital converter

using ultra low supply voltage on transistor level. With a charge recycling spilt

capacitive DAC using set and down switching method. And a comparator with a dynamic

amplifier, resulted in a very energy efficient SAR ADC. The ADC got a samplings rate of

50k Hz and an ENOB of 7.89 bits, while only draining 75nW power from a 0.5V supply.

This results in a Walden FOM of 7.39fJ/conv.step.

NTNU