Synopsys, Inc.

Michael Z Chui

He Dong

Shan Yuan

Andrey Y Tarasevich

In accordance with an exemplary simulation technique, an improved selective application of Newton-Raphson iterations can improve accuracy while ensuring good performance. In this method, selectively applying Newton-Raphson iteration in a simulation of a unit of the integrated circuit design can include determining second order effects to define a linearity value. Newton-Raphson iteration is performed when the linearity value is less than a linearity threshold and convergence of the simulation is not achieved.

Electronic circuit simulation method with adaptive iteration

In a fast simulation technique, the output node of a power supply module of the integrated circuit can be designated as an ideal power node. At this point, the power supply module can be designated a fan-in block and any blocks connected to the power node can be designated fan-out blocks. Then, DC initialization and transient simulation for each time step can be performed for the circuit. During the transient simulation, any inter-relationship of the fan-out blocks can be determined and a sensitivity model can be calculated for each fan-out block. Because the power node is designated as an ideal power node, the results of the sensitivity model for each fan-out block can be added asynchronously to a total loadings of the power node. The total loadings can be loaded into a matrix, which is computed for the fan-in block, and a simulation waveform point can be output.

Growing community of inventors

Los Altos Hills, CA, United States of America

Michael Z Chui