A methodology for designing analog to digital (A/D) converters based on a hierarchic network is explored. The principle of this methodology and design procedure are presented. The characteristics and performances of the converter are compared with the converter based on the Hopfield network. Two circuit models for the A/D converters are described in this paper. As a hierarchic network is used, the A/D converters designed have no local minima in their operation, With the method proposed in the paper, high bit number A/D converters can be easily designed, and the converters designed are fast in signal conversion and stable in operation.