We consider a design problem of a variable gain robust output feedback controller with guaranteed L2 gain performance for a\r\nclass of Lipschitz uncertain nonlinear systems. The proposed variable gain robust output feedback controller achieves not only\r\nrobust stability but also a specified L2 gain performance. In this paper, we show that sufficient conditions for the existence of the\r\nproposed variable gain robust output feedback controller with guaranteedL2 gain performance are given in terms of linear matrix\r\ninequalities (LMIs). Finally, a simple numerical example is included.
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