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 multiple feedback](img/lowpass_mfb.png)
- Lowpass with Sallen-Key-circuit, gain 0 dB, order 1..30:
![Lowpass with Sallen-Key-circuit, gain 0 dB](img/lowpass_sk.png)
- Lowpass with Sallen-Key-circuit, gain > 0 dB, order 1..30:
![Lowpass with Sallen-Key-circuit, gain > 0 dB](img/lowpass_skv.png)
- 3rd order Sallen-Key lowpass with one opamp, gain 0 dB:
![3rd order Sallen-Key lowpass with one opamp, gain 0 dB](img/lowpass_skx.png)
- 3rd order Sallen-Key lowpass with one opamp, gain > 0 dB:
![3rd order Sallen-Key lowpass with one opamp, gain > 0 dB](img/lowpass_skxv.png)
- Highpass with multiple feedback, order 1..30:
![Highpass with multiple feedback](img/highpass_mfb.png)
- Highpass with Sallen-Key-circuit, gain 0 dB, order 1..30:
![Highpass with Sallen-Key-circuit, gain 0 dB](img/highpass_sk.png)
- Highpass with Sallen-Key-circuit, gain > 0 dB, order 1..30:
![Highpass with Sallen-Key-circuit, gain > 0 dB](img/highpass_skv.png)
- 3rd order Sallen-Key highpass with one opamp, gain 0 dB:
![3rd order Sallen-Key highpass with one opamp, gain 0 dB](img/highpass_skx.png)
- 3rd order Sallen-Key highpass with one opamp, gain > 0 dB:
![3rd order Sallen-Key highpass with one opamp, gain > 0 dB](img/highpass_skxv.png)
- Bandpass with multiple feedback, order 2..30:
![Bandpass with multiple feedback](img/bandpass.png)
- Bandreject with twin-T, order 2:
![Bandreject with twin-T](img/notch.png)
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