A filter is provided that is formed of multiple filter stages arranged in series. Each of these filter stages has an input tap at its input that can be selectively connected to a filter input signal, and an output tap at its and output that can be selectively connected to an output selection circuit. Adjacent pairs of filter stages can also be isolated from each other. By selectively connecting the various input and output taps, and selectively isolating pairs of filter stages from each other, the filter can be formed into a single long filter or a plurality of parallel filters anywhere in size from one filter stage up to half the total number of filter stages. The output selection circuit can then sequentially select whatever filter stage outputs are connected to it and provide those as a general filter output.