Multiple Input Multiple Output current-mode universal biquad filters

Multiple-Input Multiple Output (MIMO) universal biquad filters are introduced in this paper. They are constructed from appropriately configured current mirrors in order to realize the required integration and summation/subtraction operations. Attractive characteristics of the proposed topologies are the capability for low-voltage operation and electronic adjustment of the resonant frequency. The last one is achieved by utilizing the input resistance of the current mirrors in the employed integrators topology. The performance of the filters has been studied through simulation results.