GFT, General Feedback Theorem for Dual voltage/current injection

GFT summary, GFT manual
In this analysis
(actual GFT.SCP file), we use a behavioral multiplexer within a subcircuit named Xgft to reconfigure the null parameters for each of the 13 AC simulations. To make the script work in a general sense, it is necessary for the user to ALWAYS name the GFT model Xgft. There are 16 GFT models to choose from. Look in GFT templates to see how to match the model with the appropriate template. You can find a drawing example in BJTAmplifier.dwg. The variations account for different methods of signal injection and 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:

Voltage Gain, Current Gain, Transimpedance, Transadmittance

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