A 9-bit 1-MS/s 7-μW SAR ADC for ultra low power radio

A 9-bit 1-MS/s successive-approximation (SAR) analog-to-digital converter (ADC) for ultra low power radio applications using 130 nm CMOS is presented. The ADC achieves a power consumption of 7/μW according to simulation results. This ultra low power is realized by employing a maximally simplified ADC architecture that consists of a dynamic latch comparator, a charge redistribution digital-to-analog converter (DAC), and a SAR logic block based on transmission gate flip-flops. Working at a supply voltage of 0.8 V, the SAR ADC achieves a FOM of 15 fJ/conversion.