Patent ID: 6219630
Filing Date: 2001-04-17
Classification: G06F

Abstract:
A circuit extracting apparatus for extracting circuit information for use in circuit simulation by a circuit simulator that determines a drain current and a gate capacitance of a transistor based on only the transistor size from a mask layout of a semiconductor circuit, comprising:means for obtaining an equivalent transistor size for a transistor contained in said semiconductor circuit based on a configuration and a size of said transistor recognized in said mask layout, such that a drain current of said transistor in the circuit simulation coincides with a drain current of said transistor in an actual device, andmeans for: determining a virtual gate capacitance of said transistor in the circuit simulation based on said equivalent transistor size: determining another gate capacitance of said transistor in the actual device based on the configuration and size of said transistor recognized in said mask layout; and generating a corrective capacitance corresponding to the difference between said virtual gate capacitance and said another gate capacitance, whereindata on said equivalent transistor size and said corrective capacitance serves as the circuit information for use in the circuit simulation.