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Abstract: This paper presents a method towards hierarchical symbolic analysis of linear analog circuits using twoport networks. The important difference to the ordinary flat symbolic analysis is, that we treat the transistor pairs as blocks and then derive the transfer function with network analyzer without to setup and solve a complicated DAE system for a whole analog circuit. The hierarchical idea can be even used to large circuits in divide and conquer manner. Experimental results obtained with some applications of this method are presented. Key–Words: Symbolic analysis, Two-port network 1

The systematic design of a high-speed, high-accuracy Nyquistrate A/D converter is proposed. The presented design methodology covers the complete flow and is supported by software tools. A generic behavioral model is used to explore the A/D converter's specifications during high-level design and exploration. The inputs to the flow are the specifications of the A/D converter and the technology process. The result is a generated layout and the corresponding extracted behavioral model. The approach has been applied to a real-life test case, where a Nyquist-rate 8-bit 200 MS/s 4-2 interpolating/averaging A/D converter was developed for a WLAN application.

The paper deals with some open problems from the area of symbolic and semisymbolic modeling of linear systems, focusing on combining the symbolic, semisymbolic and numeric computation.