Simple derivation and proof of geometrical stability criteria for linear two-ports

This paper presents a simple derivation of the single-parameter geometrical stability criteria for linear two-ports. The derivation is directly based on the classical constraints familiar to most circuit designers with regard to stability circles and stable regions. A straightforward proof of the mutual implications of various geometrical stability criteria involving dual or single parameters is also provided in a concise manner. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 81–83, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11291