Various embodiments of the present invention provide systems and methods for signal equalization, and in some cases analog to digital conversion. For example, an analog to digital converter is disclosed that includes a comparator bank that receives a reference indicator and is operable to provide a decision output based at least in part on a comparison of an analog input with a reference threshold corresponding to the reference indicator. A range selection filter is included that has a first adjustment calculation circuit and a second adjustment calculation circuit. The first adjustment calculation circuit is operable to calculate a first adjustment feedback value based at least in part on a speculation that the decision output is a first logic level, and the second adjustment calculation circuit is operable to calculate a second adjustment feedback value based at least in part on a speculation that the decision output is a second logic level. A selector circuit selects the first adjustment feedback to generate the reference indicator when the decision output is the first logic level, and selects the second adjustment feedback to generate the reference indicator when the decision output is the second logic level.