In this letter a new structure of multifunctional frequency filter using a universal voltage conveyor (UVC) is presented. The multifunctional circuit can realize a low-pass, high-pass and band-pass filter. All types of frequency filter can be realized as inverting or non-inverting. Advantages of the proposed structure are the independent control of the quality factor at the cut-off frequency and the low output impedance of output terminals. The computer simulations and measuring of particular frequency filters are depicted.

This letter describes new active building blocks defined as the generalized voltage conveyor (GVC) and the generalized current conveyor (GCC). A very simple practical realization of the GVC using the second generation current conveyors (CCII) is given. The special cases of the first generation voltage conveyor (VCI) and the second generation voltage conveyor (VCII) are also considered. A practical realization of the GCC using the CCII is also given. Applications of the voltage and current conveyors in oscillators are considered.