This paper presents mathematical modeling and performance evaluation of different realizations of universal periodic digital signal generator based on infinite impulse response filter. The development kit used was Spartan 3E-Starter Board. Using Xilinx software environment and VHDL, the generator has been described and then synthesized and implemented on FPGA chip on the board. Included realizations are direct form II (canonical form) of the filter, as well as hardware optimized single register structure with different control mechanism. Comparative analysis of these two digital systems points to their differences, advantages and weaknesses.