A List of Active Filter Circuit Topologies
Shown below are the 78 circuit solutions available in
Filter Wiz PRO, organized into the following categories:
- 1st order low pass
- 1st order high pass
- 2nd order low pass
- 2nd order high pass
- 2nd order band pass
- 2nd order low pass notch
- 2nd order high pass notch
- 2nd order notch
1st Order Low Pass
| Low Pass I | Low Pass II | Low Pass III |
 |
 |
 |
1st Order High Pass
| High Pass I | High Pass II | High Pass III |
 |
 |
 |
| High Pass IV | ||
 |
2nd Order Low Pass
| Sallen-Key I | Sallen-Key II |
 |
 |
| Multiple Feedback I | Multiple Feedback II |
 |
 |
| Fliege | Bach |
 |
 |
| Twin-T | KHN |
 |
 |
| KHN Inverting | Tow-Thomas |
 |
 |
| MB | Berka-Herpy |
 |
 |
| Akerberg-Mossberg | PMG |
 |
 |
| Natarajan | |
 |
2nd Order High Pass
| Sallen-Key I | Sallen-Key II |
 |
 |
| Multiple Feedback I | Fliege |
 |
 |
| Twin-T | KHN |
 |
 |
| KHN Inverting | MB |
 |
 |
| Berka-Herpy | Akerberg-Mossberg |
 |
 |
2nd Order Band Pass
| Deliyannis I | Deliyannis II |
 |
 |
| Sallen-Key | Multiple Feedback I |
 |
 |
| Multiple Feedback II | Fliege |
 |
 |
| Twin-T | KHN |
 |
 |
| KHN Inverting | Tow-Thomas |
 |
 |
| MB | Berka-Herpy |
 |
 |
| Akerberg-Mossberg | PMG |
 |
 |
| Natarajan | |
 |
2nd Order Low Pass Notch
| Friend's SAB | Scultety |
 |
 |
| Boctor | Fliege |
 |
 |
| Twin-T | KHN |
 |
 |
| KHN Inverting | MB |
 |
 |
| Berka-Herpy | Akerberg-Mossberg |
 |
 |
| Natarajan | |
 |
2nd Order High Pass Notch
| Friend's SAB | Scultety |
 |
 |
| Fliege | Twin-T |
 |
 |
| KHN | KHN Inverting |
 |
 |
| MB | Berka-Herpy |
 |
 |
| Akerberg-Mossberg | Natarajan |
 |
 |
2nd Order Notch (Band Reject)
| Sallen-Key | Fliege |
 |
 |
| Twin-T I | Twin-T II |
 |
 |
| KHN | KHN Inverting |
 |
 |
| MB | Berka-Herpy |
 |
 |
| Akerberg-Mossberg | Natarajan |
 |
 |
