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*You start with the original (basic) GIC structure consisting of two NIC in series.
*Because of stability, two different NIC types are necessary because TypA allows a negative load impedance and typ B allows a negative source impedance.
*Then, calculate the overall input impedance
* As a last step you arrive at the classical form (Antoniou) by a simple but intelligent modification of the structure. For ideal opamps it is allowed to interchange some inputs of both opamps. (see below)
*This is even an advantage over the original structure because for real opamps the non-idealities cancel each other up to a certain extent.
Since (for ideal opamps) all inputs have the same voltage you simply can exchange the non-inverting inputs of both opamps. This leads to the Antoniou structure.
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