General Fundamentals: Large Signal S-Parameter Analysis Method Using S-NAP/Pro

Create a linear equivalent circuit and perform linear analysis including surrounding elements.

When a large signal is input into a circuit, it is a well-known fact that the S-parameters of the circuit differ from those in the small signal case if there are nonlinear elements present. In S-parameter analysis, the treatment of active devices generally involves creating linear equivalent circuits such as hybrid pi models at the bias point from models like the Gummel-Poon model, and performing linear analysis including surrounding elements. The linear equivalent circuit at the bias point maintains a linear input-output relationship regardless of how distorted the bias point may be, and does not introduce distortion in the output. To investigate the circuit characteristics when a large signal is input or when the bias point lies in a higher-order curve region, it is best to calculate the S-parameters from the input-output ratio of the fundamental wave component while in the state of large signal input. S-NAP-Pro does not have a direct function to obtain large signal S-parameters, but it is possible to achieve this using harmonic balance. [Features] - Create circuits with ports similar to S-parameter analysis - Label the terminals of each port in the circuit For more details, please contact us or download the catalog.

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