GIC realized inductor is showing angle close to 90 degree for particular frequency zone and that zone is varying depending on the resistances/ capacitances I used. But the correlation is not clear to me. Can anyone help me on this or cite the necessary literature/ books?
According to my knowledge the real source of these restrictions are the non-idealities of the used opamps only.
That means: For IDEAL opamps the circuit (active L) works for all values of R and C. However, it is true that the amount of deviations from the ideal behaviour can be influenced by resistors/capacitor values. But that is a known effect. Also for a simple opamp amplifier, both gain-defining resistors should be selected taking the opamps non-idealities into account (not too low and not too large).
Regarding the active L-simulation (GIC): Numbering the 5 elements of a GIC from Z2 to Z6 and choosing Z5=1/sC5 we have an active inductor. For this circuit, L. Bruton has shown that for optimum behaviour (less influence of the opamps limited GBW) we should use Z3=Z4=R3=R4.
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