Nonlinear Distortion in Feedback Systems
01 April 1968
Desoer gives an interesting analysis of distortion resulting from a nonlinearity of the form v + evm (m an odd integer) in a feedback loop.1 Sandbcrg considers virtually the same problem for nonlinearities with upper and lower bounds on the slope.2 On page 2546 of his work, Sandberg suggests that Desoer's result may be sharpened. Our purpose is to show how a small modification of Desoer's analysis might give this sharpening and extend its applicability. Desoer's method is to find conditions for a particular mapping to be a contraction in a ball. The method presented in another work is particularly suited to that problem and will be applied in this paper. 3 The problem of distortion in nonlinear systems is also considered in References 4 and 5 among other papers.