The Modified Chamberlin and Zölzer Filter Structures
The Chamberlin and Zölzer filter structures run a risk, albeit small, of requiring a large value for one of their tuning coefficients, which may lead to performance issues. A simple modification leads to alternative structures that place an absolute bound on that coefficient while retaining the signal flow topology. The modified structures also affect the pole distribution. In the case of the Chamberlin structure, the changes upon modification can be interpreted as favorable.