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This article deals with OTA-C frequency filter design using the Mason-Coates signal-flow graphs. The procedure of universal circuit design that can realize low-pass, high-pass, band-pass, band-rejection and all-pass frequency filters working in the current mode as well in the voltage mode is shown. The cut-off frequency and quality factor of the frequency filters can be controlled independently. Controlling the circuit is realized by changing the transconductance of the OTA amplifiers used.