I have added a new App Note describing an interesting "half ladder" filter that uses the Moog ladder topology but produces a 2nd order filter instead. As with the Moog Ladder, passband gain is reduced as Q increases, but not as much. The new app note is here:
If you have any questions or comments please feel free to post your questions to this Forum topic.
NOTE: the sample code implements both the full (4th order) and half (2nd order) filters.
With the APF in the half ladder, will the phases match up with the full ladder?
I guess what I'm wondering is what would happen if you ran the input through both the full and half ladder and then mixed them? Would you get useful mixed states (something like a 18dB filter in the middle)? Or would you get weird comb filtering?
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