An analog to digital converter contain a plurality of comparators, each having a plurality of positive input voltage transistors and a plurality of negative input voltage transistors. Each positive input transistor is in communication with a positive input voltage, and each negative input transistor is in communication with a negative input voltage. Each comparator is configured to adjust a positive reference voltage and a negative reference voltage used to generate a binary comparator output for each comparator indicating a result of a comparison between a voltage differential defined by the positive input voltage and the negative input voltage and a unique voltage range indicated by a unique digital reference signal communicated to each comparator.