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1 Electron Technology : Internet Journal

1 2002

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An efficient synthesis-oriented CAD implementation of Nyquist stability criterion

Centurelli F., Luzzi R., Scotti G., Tommasino P., Trifiletti A.

Electron Technology : Internet Journal

2001/2002

Vol. 34, nr 2

1-5

Nyquist stability criterion is largely used to determine the number of Right-Half Plane poles of feedback systems and circuits. However, visual inspection of open-loop gain polar plot is required, and automatic stability check within microwave CAD tools is not possible. In this paper, a procedure to check system and circuit linear stability by means of Nyquist criterion within CAD tools, is presented. The proposed method makes use of integral phase evaluation of a transfer function, and does not require visual inspection of Nyquist plots. The method has been successfully implemented in commercial microwave CAD tools.