CMOS CURRENT-MODE MULTIVALUED PLAS

This paper presents a new PLA structure for the implementation of multivalued combinational and sequential systems. The proposed PLA makes a NOR/TSUM two-level synthesis of multivalued functions using a minimal number of literals for each variable. PseudonMOS and dynamic CMOS implementations for the proposed PLA are also presented, using current-mode inputs and outputs. Since these PLA's operate with several current levels, a significant saving in silicon area may be obtained, in comparison with binary PLA's. A four-valued PLA prototype was manufactured using an ordinary CMOS process. The paper includes experimental measures for this prototype.