Abstract: Traditionally, successive approximation register (SAR) analog-to-digital converters (ADCs) using binary search algorithms have consumed power by performing unnecessary switching of a capacitive digital-to-analog converter (CDAC) when a CDAC voltage is relatively close to a sampling analog input signal. Here, a SAR ADC is provided that reduces the number of switching events. To accomplish this, a multi-stage comparator is provided that generates multiple output signals for SAR logic. Based on these outputs, the SAR logic can more efficiently switch its CDAC using a ternary search algorithm to reduce power consumption and improve efficiency.