This component models the transfer characteristic of a device, circuit or system in the s domain. The transfer function block is specified as a fraction with polynomial numerators and denominators. This component may be used in DC, AC and Transient analyses.

Characteristic Equation

This transfer function model is defined in a form of the rational function:

Transfer functions up to the 5th order may be modeled.

In the example shown below, the transfer function for a simple first order low pass filter is used. Only the numerator and denominator constants A0 and B0 are required in this case. These are equal to 2π times the cut-off frequency (first pole).

The cursor on the Bode Plotter may be used to confirm first order performance with -3 dB at 10 kHz and rolloff of 6 dB per octave above 20 kHz.