Converting Capacitance to inductance: Active Inductor with Op Amps

Large inductors are bulky, inefficient with low Quality factors. An active inductor can be realized using just two operational amplifiers, one capacitor and a few resistors. It is shown that with proper selection of the components in this circuit, we can realize an inductive impedance (Ls) as seen from the input of the shown circuit. The value of L can be controlled by the values of resistors and capacitor in this circuit.

[voicevoicelessKrzysiek]

Love it! It reminded me of the Gyrator circuit, in which the property of this circuit is being used. I found it in the famous book "The Art of Electronics" by Paul Horowitz and Winfield Hill.🙂

[Parirash]

Very good analog collection. Subscribed

[wafikiri_]

Real magic (i. e., sufficiently advanced technology)!
Many thanks!
Now it's a matter to finding out a suitable application for my purposes.

[STEMprof]

Note that practical inductors have limited range of inductance. The larger the inductance, the bulkier, more expensive and more nonlinear that inductor becomes (low quality factor). For example the whole circuit including rest of components might be much smaller than just a single one milliHenry inductor. I hope this is helpful.