Pass-transistor logic circuit and a method of desi

专利名称：Pass-transistor logic circuit and a method of

designing thereof

发明人：Norimitsu Sako申请号：US08965771申请日：19971107公开号：US06185719B2公开日：20010206

专利附图：

摘要：A method of designing a logic circuit including pass transistors is disclosed. Alogic group having a complementary variable in a given logical expression to be realizedinto the logic circuit is mapped using a multiplexer composed of a combination of the

pass transistors. The number of transistors used in the logic circuit and the number ofstages can be reduced by taking advantage of the multiplexer. When a logic circuitincluding both pass transistors and a multiple-input logic gate is designed, a logic grouphaving a common variable in the given logical expression is mapped using the multiple-input logic gate. The number of transistors used in the logic circuit and the number ofstages can be further reduced by taking advantage of the multiple-input logic gate. Inorder to ease the above mapping procedure, a complementary variable is identified andthe given logical expression is optimized by grouping product terms of the logicalexpression by the complementary variable. Furthermore, a common variable is identified,and the logical expression is further optimized by grouping product terms of the logicalexpression by the common variable.

代理机构：Oliff & Berridge, PLC

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