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- An interactive systemcalled SIASCA which automates the calculation of symbolic expressions (SEs) representing the dominant behavior of analog circuits, is introduced. SIASCA includes a more general class of active devices whose behavior is modeled at different levels of abstraction using nullors in order to enhance,the capabilityof symbolic analysis to calculate simplified SEs.  Key-Words: - Symbolic Analysis, Analog Design Automation, FrequencyResponse, Nullor.  1 Introduction,2 The modeling approach Symbolic  analysis  is  focused ,on  the ,calculation  of  simplified SEs [1]-[6], which represent the dominant behavior of an analog circuit. The calculated SEs help the designer to gain insight and get an inference about the behavior of a circuit. Furthermore, it is verym uch needed that the calculation of SEs be guided,towards an interactive design process by generating analytical design equations,  useful  for  synthesis  and  optimiza- tion procedures  [7]-[9].  In  this  manner,  this  paper  is  focused on the development of an,interactive system called SIASCA,  which  calculates  simplified  SEs  of  analog circuits. As shown in Fig. 1, SIASCA includes amore general class of devices, namely: opamps [4], OTAs [5],  CCII-  [7],  BJT  and  MOSFET.  The  basic  set of primitives [2]: controlled sources, independent sources, resistor,  inductor  and  capacitor  are  selected  from  the  Elements  button.  The  analog  ground  sets  a  reference node  to  (0),  as  it  is  usually  done  by  any  circuit simulator  alike  SPICE.  SIASCA  has  been  developed under  Visual  Java++,  while  the  analysis

SIASCA: Interactive System for the Symbolic Analysis of Analog Circuits