Patent ID: 8718987

Claim:
A method of constructing a circuit simulation model for a capacitor having a DC bias applied thereto, comprising steps of: configuring, in a computer, a basic equivalent circuit for a capacitor; deriving a circuit equation for a voltage and a current based on the configured basic equivalent circuit; obtaining a characteristics change in a circuit element included in the basic equivalent circuit caused by the DC bias by actual measurement; expressing the obtained characteristics change in the circuit element by a polynomial, and replacing the circuit element with a nonlinear voltage dependent voltage source defined by the polynomial; constructing a calculation circuit that supplies a component of the DC bias extracted from a voltage applied across the capacitor to the nonlinear voltage dependent voltage source and that performs calculation of the circuit equation by utilizing an output voltage of the nonlinear voltage dependent voltage source; and applying the voltage applied across the capacitor to the calculation circuit through a linear voltage dependent voltage source.