Detailed study of the problems of analysis and synthesis, the design of circuits and devices for high frequency operation with the choice of the most important elements in the field. (The wave concept and signal delay phenomenon, scattering parameters, lines, lines termination, modelling elements of digital circuit using lines, modelling printed board connections, modelling connectors, modelling cables. Coupled lines and procedures for reducing signal crosspoint, signal integrity. Techniques for measuring high frequency digital signals, problems in measuring, probe effect. Fundamentals of designing multilayer printed board, types of connections on a printed board, supply distribution, supply filtering using capacitors, global sync signal distribution, distribution topology, crosspoint control. Phase loops – PLL circuits. Electrostatic discharge at connectors, cables for high frequency operations, noise in cables, generic structure of cables. Radiation with high frequency circuits, electromagnetic compatibility, techniques for reducing radiation. Fundamentals of mixed fast digital-analogue circuits.) The course is partially based on individual study and research work in the field of complex digital systems and high frequency circuits. Study and research work is based on the primary scientific sources, organization and conduction of experiments as well as statistical analysis of data, numerical simulations, and writing a paper on the narrow scientific area in which doctoral dissertation is based.