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User:Constant314/Generalized Impedance Converter

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A generalized impedance converter or GIC is a sub-circuit that can be used to implement an active impedance. Its applications include implementations of simulated inductors, gyrators, frequency dependent negative resistors, second order active filters and second order active filters with transmission zeroes. A variety of implementations exist. Temes describes four implementations, but notes that the different implementations have different stability properties.[1]: 274–276  Chen[2]: 2400  and Wait[3]: 290  describe circuits based on state variable filters.



Schematic

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Applications

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simulated inductor

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frequency dependent negative resistor

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Schematic of a frequency dependent negative resistor.

Wait gives the circuit shown to the right as suitable for a grounded FDNR.[3]: 290 

gyrator

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Gyrator schematic labelled
Schematic of a grounded gyrator described by Temes and LaPatra.

References

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  1. ^ a b Temes, Gabor C.; LaPatra, Jack W. (1977), Circuit Synthesis and Design (1st ed.), McGraw-Hill, ISBN 007063489-0
  2. ^ Chen, Wai-Kai (1995). The Circuits and Filters Handbook. CRC Press. ISBN 0-8493-8341-2.
  3. ^ a b c Wait, John V.; Huelsman, Lawrence P.; Korn, Granino A. (1992), Introduction to Operational Amplifier Theory and Applications (2nd ed.), McGraw-Hill, ISBN 007067770-0