looking for a texas instrument solution

I want to build a low pass filter fourth order but I want to replace the coils by an integrated circuit that simulates the coil.
before existed the AF120 the Generalized Impedance Converter , GIC but do not make more .
I wonder if texas instrument have any solution to replace the integrated circuit

Hi Juan,

Indeed it is possible to synthesize a low-pass response using a general immittance converter (GIC), but that approach doesn't seem to be applied much anymore. More common filter topologies such as the Multi-feedback (MFB) and Sallen-key are most often applied in active filters. Commonly available filter synthesis program use these two because of ease of use and good performance.

If you would like to try designing a replacement active filter for the GIC, TI has a active filter syntheses program Webench Filter Designer, that might prove useful. You can access the program through a Webench web page:

This could serve as a starting place. Once you have a filter designed you can select an op amp that meets its requirements.

Regards, Thomas

PA - Linear Applications Engineering