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My IIR filter is outputting a value, even when the input goes to zero. Is this a bug?

Question asked by BrettG on Jan 31, 2012
Latest reply on Jan 31, 2012 by BrettG

I have a tone generator in SigmaStudio connected to a filter and then a peak detector. When I turn the tone on, I get the expected peak value. However, when I turn the tone off, the value doesn't quite reach zero. It just decays to a very small number. When I remove the filter and try again, the output value goes to zero. What's going on? Is this a bug?