Extracting complete set of equations to analyze VHDL-AMS descriptions

System designers are increasingly interested in the use of tools and methods letting them describe and simulate mixed signal systems. A pioneer description language for this purpose is VHDL-AMS. Due to special features of this language, the traditional method of analog-circuits analysis, the nodal analysis method that is used in most analog simulators, such as SPICE, cannot be used in simulators using this language. In this paper we present an algorithm that can be used for analysis and simulation of analog parts of systems described in VHDL-AMS language. This algorithm has been used in the analysis engine of a mixed-signal simulator based on VHDL-AMS, and the validity of its operation has been shown.