GFT, General Feedback Theorem for single current injection

GFT summary, GFT manual
In this analysis
(actual GFTj.SCP file), we use a behavioral multiplexer within a subcircuit named Xgft to reconfigure the null parameters for each of the 5 AC simulations. This is a single current injection point. It should only be connected to the output of a high  impedance source. To make the script work in a general sense, it is necessary for the user to ALWAYS name the GFT model Xgft. There are 4 GFT models to choose from. Look in GFT templates to see how to match the model with the appropriate template. The variations account for input/output signal variation for voltage gain, current gain, transadmittance and transimpedance. The GFT template is used to get an accurate measure of a control system characteristic equations, including "the" loop gain and closed loop gain even when the loop cut or injection point experiences significant loading. After running the simulation, you can plot the various control system parameters using the IntuScope calulator\GFT menu. The following examples are available only with the full ICAP/4 versions, they do not ship with the demo: (both voltage and current injection are contained in the following drawings, use the "Options/Configurations" to select the appropriate congiguration,)

Voltage Gain, Current Gain, Transimpedance, Transadmittance.

Other simulation templates for the GFT include GFTE, GFTEE, GFT, GFTJJ, GFTS and GFTTIME