INNOVATIVE STRUCTURES FOR CMOS COMBINATIONAL GATES SYNTHESIS

Design of multiple outputs CMOS combinational gates is studied. Two te chniques for minimization of multiple output functions at the switchin g level are introduced. These techniques are based on innovative trans istor interconnection structures named Delta and Lambda networks. The two techniques can be combined together to obtain further area reducti ons. Different synthesis algorithms are discussed, from exhaustive enu meration to branch and bound to heuristic techniques allowing to speed up the synthesis process. Simulation results for synthesis are introd uced to compare the different algorithms. Design examples are also pro vided. Electrical simulations show that the dynamic behavior of such s tructures is comparable to the traditional static or domino implementa tions (obviously the new and traditional structures have the same stat ic behavior).