Filter circuits supported by AktivFilter 3.3
The following filter circuits can be designed by AktivFilter 3.3.
The pictures show only one stage of a filter, because any stage
of a filter has the same circuit (but different component values).
- Lowpass with multiple feedback, order 1..30:

- Lowpass with Sallen-Key-circuit, gain 0 dB, order 1..30:

- Lowpass with Sallen-Key-circuit, gain > 0 dB, order 1..30:

- 3rd order Sallen-Key lowpass with one opamp, gain 0 dB:

- 3rd order Sallen-Key lowpass with one opamp, gain > 0 dB:

- Highpass with multiple feedback, order 1..30:

- Highpass with Sallen-Key-circuit, gain 0 dB, order 1..30:

- Highpass with Sallen-Key-circuit, gain > 0 dB, order 1..30:

- 3rd order Sallen-Key highpass with one opamp, gain 0 dB:

- 3rd order Sallen-Key highpass with one opamp, gain > 0 dB:

- Bandpass with multiple feedback, order 2..30:

- Bandreject with twin-T, order 2:

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