Switched-current wave analog filters

A novel approach to the realization of switched-current (SI) filters is presented. This approach relies on wave filter functions, which the authors have proved to be particularly suitable for switched-current implementations owing to the simplicity of SI realization for summation, scaling, and time delay operations. Filter design using this concept requires a limited library of modular building blocks (adaptors and delay elements). The total size, power consumption, and dynamic range of these building blocks can be made nearly independent of the filter function coefficient values, which enables the practical realization of wave SI filters over a wide range of bandwidths.