Active Band-Stop Filter Synthesis Based on Nodal Admittance Matrix Expansion

摘要

Active network synthesis is important for circuit designer to find new circuits with desired performance. In this paper, a synthesis method for synthesizing active band-stop filters is presented, which starts from voltage transfer function and linked infinity variables to describe nullors in both nodal admittance matrix (NAM) and port admittance matrix of the circuit to be synthesized. Then circuit topology is derived by nodal admittance matrix expansion. The Tow-Thomas band-stop filter circuit and Akerberg-Mossberg band-stop filter circuit are synthesized by nodal admittance matrix expansion on the same port admittance matrix. A design example of band-stop filter verifies the effectiveness of the circuit design method.