Authors: E. Alarcón, A. Frigola, E.Vidal and A. Poveda,
Journal/Conference: Proceedings of the 39th IEEE Midwest Symposium on Circuits and Systems (MWSCAS96), Ames, Iowa, August 1996, pp. 451.
Abstract -The current-feedback operational amplifier (CFA) is an active device which uses the supply-current sensing technique in order to achieve high performance features for analog signal processing applications. However, under certain load conditions the CFA exhibits an unstable behavior. This work presents a new frequency model which takes into account the non-unilateral characteristics of the CFA buffer stages and includes the load-dependent instabilities. The model can be easily incorporated into a standard macromodel for simulation purposes or used analytically for accurate circuit design based on CFAs. As a consequence of this approach, some improvements in the CFA structure could be suggested.
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