Tabular methods for the design of CCD (Charge-Coupled Devices) multiple-valued circuits

A tabular method for the design of multiple-valued CCD circuits is introduced which produces less expensive realizations with a significantly smaller table than a method proposed by Robroek and Kerkhoff and Robroek. In addition, a universal cost table method is shown which produces even less expensive realizations, but which has a considerably longer table. Further, a flexible CCD circuit is shown which produces any unary function by a simple adjustment of voltage levels.