This work describes a new type of a phase shifter based on the recursive phase locked loop (PLL) of the second order. This PLL is described by recursive equations. It represents a new approach to PLL. Although this PLL can be used for different applications, the main emphasis is given to the phase shifting of pulse rate. The region of parameters for the stable system and the other analyses of PLL are made using the Z transform approach. Computer simulations of PLL enable better insight into the PLL properties and confirm the mathematical analyses too. The realization of PLL is described. The oscilloscope picture of the input and output pulse rates, recorded on the realized PLL is presented

Keywords: Phase locked loop (PLL), Frequency locked loops, Phase shifter, Digital circuits