Analysis of circuits containing active elements by using modified T-graphs

The so-called modified transform (T) graphs are described in the paper, which are a graph analogy to wellknown voltage and current incidence matrices. The procedure is shown how to pass from T-graphs to the classical Mason-Coates (MC) flow graph. The explanation is illustrated with examples of circuits containing operational amplifiers and current conveyors. Key-Words: Signal flow graph, flow graph, T-graph, incidence matrix, linear transformation, operational amplifier, current conveyor.