A non-iterative effective capacitance model for CMOS gate delay computing

In Static Timing Analysis, the conventional methods usually use an iterative method to ensure the accuracy of the effective capacitance C_eff, which is usually used to compute the delay of gate with interconnect load and to capture the output signal shape of the real gate response. In this paper, a polynomial approximation method is used to make the nonlinear C_eff equation be solved without iterative method. Compared to the conventional methods, the proposed method has the merit of improving the efficiency for C_eff calculation. Meanwhile, experimental results show that the proposed method is in agreement with the Spice simulation.