This is new in AktivFilter 3

Compared to the previous version AktivFilter 2.4, the new version AktivFilter 3 has numerous innovations.

Here is a short survey:

When you input the capacitor values, the values stay unchanged, even if you change the specification. So these values need not to be put in again.
When specifying a bandpassfilter, you input the bandwidth (instead of the quality).
When you design a multi-stage filter, the gain can be distributed equally over all stages or the gain of each stage can be choosen depending on the quality and pole-frequency of the stage. Thus the influence of real opamp-parameters on the filters frequency response can be clearly reduced. Furthermore, when designing a multistage highpass- or lowpassfilter you can alternatively input the gain of each stage individually.
When you design a bandpass, the resistor R2, which determines the resonance frequency, can be calculated alternatively with a continious value.
The menuitem "Result" has a new item "Filterparameters", which shows the characteristical filterparameters frequency and gain of each stage.
The graphical output of the frequency response can additionally show the group delay response (activation under menuitem Options - Graphics...).
In the graphical output of the frequency response a cursor with the actual coordinates (frequency, gain, group delay) is shown.
The graphical output of the frequency response can be printed out quickly and easily by choosing a menuitem (File - Print...).
The structure of the menu has been adjusted according to the standard of most Windows-programs.
The software code has been refactored and big parts of the code have been rewritten. The rendering of the graphical output has been improved by using a new algorithm.
The program is now 100 % compatible with Windows Vista and Windows 7. Users of Windows XP and Windows 2000 have no disadvantages from that.
The new Professional Edition allows you to integrate your own opamp-models into the program. For this, the AktivFilter 3 Professional Edition is delivered together with the tool OpAmp-Modell, which enables you to create precise opamp-models quickly and easily.