1. A method for converting an analog input voltage into a digital signal comprising the steps of: providing a first output voltage approximately equal to the analog input voltage at a first point in time; converting the first output voltage into a higher-order portion of a first digital output signal with a first A/D converter circuit; converting the first output voltage into a lower-order portion of the first digital output signal with a first neural network A/D converter; providing, a second output voltage approximately equal to the analog input voltage at a second point in time while performing said step of converting the first output voltage into a lower-order portion of the first digital signal; converting the second output voltage into a higher-order portion of a second digital output signal with the first A/D converter circuit; converting the second output-voltage into a lower-order portion of the second digital output signal with a second neural network A/D converter; and repeating the preceding steps to provide a plurality of first and second digital output signals.