The Extra Element Theorem (EET) is an analytic technique developed by R. D. Middlebrook for simplifying the process of deriving driving point and transfer functions for linear electronic circuits. Much like Thevenin's theorem, the extra element theorem breaks down one complicated problem into several simpler ones.
Driving point and transfer functions can generally be found using KVL and KCL methods, however several complicated equations may result that offer little insight into the circuit's behavior. Using the extra element theorem, a circuit element (such as a resistor) can be removed from a circuit and the desired driving point or transfer function found. By removing the element that most complicates the circuit (such as an element that creates feedback), the desired function can be easier to obtain. Next two correctional factors must be found and combined with the previously derived function to find the exact expression.
The general form of the extra element theorem is called the N-extra element theorem and allows multiple circuit elements to be removed at once.
Read more about Extra Element Theorem: Driving Point Impedances, Feedback Amplifiers
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