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Large-signal model

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The expression "large signal" is used in electrical engineering, when discussing signals in a circuit containing nonlinear elements (such as transistors, diodes, vacuum tubes). Under "large signal conditions", AC signals have a sufficiently high magnitude, so that nonlinear effects must be considered. "Large signal" is the opposite of "small signal", meaning that the circuit can be reduced to a linearized equivalent circuit around its operating point with sufficient accuracy.