%0 Electronic Article %A P. Atkinson %A P.J. Thomas %K stability bound %K nonlinear control systems %K hysteresis %K describing function %K Nyquist diagram %K limit cycles %X A new and more accurate approximation for the describing function for hysteresis with saturation is described. This is based on a set of parallelograms with flat tops and gives rise to a single point on the Nyquist diagram which then becomes the stability bound. %@ 0013-5194 %T Improved describing function for hysteresis %B Electronics Letters %D April 1975 %V 11 %N 7 %P 141-142 %I Institution of Engineering and Technology %U https://digital-library.theiet.org/;jsessionid=1lkh5b3szpgoq.x-iet-live-01content/journals/10.1049/el_19750108 %G EN