The paper deals with the novel filtration techniques for analog high-speed data signal preprocessing working on the base of a pure current mode filters. Because of better current-mode properties and frequency features, and due to the tendency to lower supply voltages, which is given by the possibilities of the technology used, where the dynamic range in the voltage area goes down due to the use of the voltage mode, a fast development in the field of current-mode application design can be witnessed. The paper shows possibilities of current-mode filter realizations using only current amplifiers. The paper shows also various possibilities of current amplifier realization such as basic building blocks for circuits working in the current-mode. Current amplifier realization possibilities are presented using both the existing elements, e.g. current conveyors and OTA elements, and those based on the transistor level. The currentmode filter with only current amplifier, without any active element with voltage terminal is designed.