Optimum wire shaping of an RLC interconnect

The optimum wire shape for minimum signal propagation delay across an RLC line is shown to have a general exponential form. The line inductance makes exponential tapering more attractive for RLC lines than for RC lines. For RLC lines, optimum wire tapering achieves a higher reduction in the signal propagation delay as compared to uniform wire sizing. Wire tapering can reduce both the propagation delay and power dissipation. A reduction of 15% in the propagation delay and of 16% in the power is achieved for an example circuit.