Build accurate Spice models for low-noise, low-power precision amplifiers (EDN)

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System engineers require accurate models for all types of ICs, and they require Spice models to run comprehensive circuit simulations. Early Spice models had few nonlinear elements, minimizing simulation time at the cost of accuracy, but new methods let you increase the number of nonlinear elements and improve accuracy. You can create a multistage model for low-noise, low-power operational amplifiers. The model employs work from Analog Devices and requires several architectural changes to model a low-noise, low-power precision amplifier. The model architecture processes the input signal through eight stages. You can easily calculate the parameters for the eight stages with a handheld calculator.

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