An ordering-insensitive methodology for efficient DCVS circuit synthesis

Reduced ordered binary decision diagrams (ROBDDs) have been used for the synthesis of differential cascode voltage switch (DCVS) circuits. ROBDDs require all branches of the resultant network to have the same input ordering. Significant improvements in area can be obtained by allowing each branch of the network to have a different variable ordering, if needed. In this paper, we outline our synthesis procedure, which uses a new decision-diagram based model, the 123 decision diagram (123dd), to synthesize DCVS circuits. These circuits may have different variable orderings on different branches of the network.