The General Feedback Theorem (GFT) defines a partitioning of the input to output transfer function of a feedback network into simpler constitutent transfer functions which are ultimately expressed in terms of the

circuit elements.

 

SPICE simulation  of the transfer functions defined by the GFT can be done in at least two different ways:

 

(1) Simulate each GFT constituent transfer function directly by using high gain ac amplifiers to create approximate nulls within a simulation.  This is the approach used in the GFT simulation templates offered by Intusoft.

 

(2) Calculate each GFT constituent transfer function as a weighted sum of multiple independent simulations.  This approach was originally proposed by Dr. Frank Wiedmann.